diff --git a/include/geode/model/helpers/detail/mappings_merger.h b/include/geode/model/helpers/detail/mappings_merger.h
new file mode 100644
index 000000000..f853ec91b
--- /dev/null
+++ b/include/geode/model/helpers/detail/mappings_merger.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2019 - 2024 Geode-solutions
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#pragma once
+
+#include <geode/model/common.h>
+#include <geode/model/representation/core/mapping.h>
+
+namespace geode
+{
+    namespace detail
+    {
+        ModelGenericMapping merge_mappings(
+            const ModelGenericMapping& mappings1,
+            const ModelCopyMapping& mappings2 );
+
+        ModelGenericMapping merge_mappings(
+            const ModelGenericMapping& mappings1,
+            const ModelGenericMapping& mappings2 );
+
+        ModelGenericMapping copy_to_generic_mappings(
+            const ModelCopyMapping& mappings2 );
+
+        ModelMappings merge_mappings(
+            const ModelMappings& mappings1, const ModelMappings& mappings2 );
+    } // namespace detail
+} // namespace geode
diff --git a/include/geode/model/representation/core/mapping.h b/include/geode/model/representation/core/mapping.h
index 33909d701..eb7e98ebe 100644
--- a/include/geode/model/representation/core/mapping.h
+++ b/include/geode/model/representation/core/mapping.h
@@ -83,7 +83,7 @@ namespace geode
         }
 
         const absl::flat_hash_map< ComponentType, Mapping >&
-            components_mappings()
+            components_mappings() const
         {
             return mappings;
         }
@@ -137,4 +137,18 @@ namespace geode
     {
         MeshVertexMapping blocks;
     };
+
+    struct ModelMappings
+    {
+        ModelGenericMapping component_mapping;
+        ModelMeshesElementMapping mesh_element_mapping;
+        ModelMeshesVertexMapping mesh_vertices_mapping;
+    };
+
+    struct BRepMappings
+    {
+        ModelGenericMapping component_mapping;
+        BRepMeshesElementMapping mesh_element_mapping;
+        BRepMeshesVertexMapping mesh_vertices_mapping;
+    };
 } // namespace geode
\ No newline at end of file
diff --git a/src/geode/model/helpers/detail/mappings_merger.cpp b/src/geode/model/helpers/detail/mappings_merger.cpp
new file mode 100644
index 000000000..90cfe211d
--- /dev/null
+++ b/src/geode/model/helpers/detail/mappings_merger.cpp
@@ -0,0 +1,279 @@
+/*
+ * Copyright (c) 2019 - 2024 Geode-solutions
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include <geode/model/helpers/detail/mappings_merger.h>
+
+#include <geode/model/mixin/core/block.h>
+#include <geode/model/mixin/core/block_collection.h>
+#include <geode/model/mixin/core/corner.h>
+#include <geode/model/mixin/core/corner_collection.h>
+#include <geode/model/mixin/core/line.h>
+#include <geode/model/mixin/core/line_collection.h>
+#include <geode/model/mixin/core/model_boundary.h>
+#include <geode/model/mixin/core/surface.h>
+#include <geode/model/mixin/core/surface_collection.h>
+
+namespace
+{
+    class GenericandCopyMappingsMerger
+    {
+    public:
+        GenericandCopyMappingsMerger(
+            const geode::ModelGenericMapping& mappings1,
+            const geode::ModelCopyMapping& mappings2 )
+            : mappings1_( mappings1 ), mappings2_( mappings2 )
+        {
+        }
+
+        geode::ModelGenericMapping merge()
+        {
+            geode::ModelGenericMapping result;
+            for( const auto& component_mapping :
+                mappings1_.components_mappings() )
+            {
+                if( mappings2_.has_mapping_type( component_mapping.first ) )
+                {
+                    result.emplace( component_mapping.first,
+                        merge_mappings( component_mapping.second,
+                            mappings2_.at( component_mapping.first ) ) );
+                }
+            }
+            return result;
+        }
+
+    private:
+        geode::ModelGenericMapping::Mapping merge_mappings(
+            const geode::ModelGenericMapping::Mapping& mappings1,
+            const geode::ModelCopyMapping::Mapping& mappings2 )
+        {
+            geode::ModelGenericMapping::Mapping result;
+            for( const auto& in2between : mappings1.in2out_map() )
+            {
+                for( const auto& between_id : in2between.second )
+                {
+                    if( !mappings2.has_mapping_input( between_id ) )
+                    {
+                        continue;
+                    }
+                    result.map(
+                        in2between.first, mappings2.in2out( between_id ) );
+                }
+            }
+            return result;
+        }
+
+    private:
+        const geode::ModelGenericMapping& mappings1_;
+        const geode::ModelCopyMapping& mappings2_;
+    };
+
+    class GenericMappingsMerger
+    {
+    public:
+        GenericMappingsMerger( const geode::ModelGenericMapping& mappings1,
+            const geode::ModelGenericMapping& mappings2 )
+            : mappings1_( mappings1 ), mappings2_( mappings2 )
+        {
+        }
+
+        geode::ModelGenericMapping merge()
+        {
+            geode::ModelGenericMapping result;
+            for( const auto& component_mapping :
+                mappings1_.components_mappings() )
+            {
+                if( mappings2_.has_mapping_type( component_mapping.first ) )
+                {
+                    result.emplace( component_mapping.first,
+                        merge_mappings( component_mapping.second,
+                            mappings2_.at( component_mapping.first ) ) );
+                }
+            }
+            return result;
+        }
+
+    private:
+        geode::ModelGenericMapping::Mapping merge_mappings(
+            const geode::ModelGenericMapping::Mapping& mappings1,
+            const geode::ModelGenericMapping::Mapping& mappings2 )
+        {
+            geode::ModelGenericMapping::Mapping result;
+            for( const auto& in2between : mappings1.in2out_map() )
+            {
+                for( const auto& between_id : in2between.second )
+                {
+                    if( !mappings2.has_mapping_input( between_id ) )
+                    {
+                        continue;
+                    }
+                    for( const auto& out_id : mappings2.in2out( between_id ) )
+                    {
+                        result.map( in2between.first, out_id );
+                    }
+                }
+            }
+            return result;
+        }
+
+    private:
+        const geode::ModelGenericMapping& mappings1_;
+        const geode::ModelGenericMapping& mappings2_;
+    };
+
+    class CopyToGenericMappings
+    {
+    public:
+        CopyToGenericMappings( const geode::ModelCopyMapping& mappings )
+            : mappings_( mappings )
+        {
+        }
+
+        geode::ModelGenericMapping transfer()
+        {
+            for( const auto& component_mapping :
+                mappings_.components_mappings() )
+            {
+                result_.emplace( component_mapping.first,
+                    transfer_mappings( component_mapping.second ) );
+            }
+            return std::move( result_ );
+        }
+
+    private:
+        geode::ModelGenericMapping::Mapping transfer_mappings(
+            const geode::ModelCopyMapping::Mapping& copy_mappings )
+        {
+            geode::ModelGenericMapping::Mapping result;
+            for( const auto& in2out : copy_mappings.in2out_map() )
+            {
+                result.map( in2out.first, in2out.second );
+            }
+            return result;
+        }
+
+    private:
+        const geode::ModelCopyMapping& mappings_;
+        geode::ModelGenericMapping result_;
+    };
+
+    geode::MeshElementMapping merge_element_mappings(
+        const geode::MeshElementMapping& mappings1,
+        const geode::MeshElementMapping& mappings2 )
+    {
+        geode::MeshElementMapping result;
+        for( const auto& first_mapping : mappings1.in2out_map() )
+        {
+            for( const auto& intermediate_element : first_mapping.second )
+            {
+                if( !mappings2.has_mapping_input( intermediate_element ) )
+                {
+                    continue;
+                }
+                for( const auto& out_element :
+                    mappings2.in2out( intermediate_element ) )
+                {
+                    result.map( first_mapping.first, out_element );
+                }
+            }
+        }
+        return result;
+    }
+
+    geode::MeshVertexMapping merge_vertex_mappings(
+        const geode::MeshVertexMapping& mappings1,
+        const geode::MeshVertexMapping& mappings2 )
+    {
+        geode::MeshVertexMapping result;
+        for( const auto& first_mapping : mappings1.in2out_map() )
+        {
+            for( const auto& intermediate_vertex : first_mapping.second )
+            {
+                if( !mappings2.has_mapping_input( intermediate_vertex ) )
+                {
+                    continue;
+                }
+                for( const auto& out_vertex :
+                    mappings2.in2out( intermediate_vertex ) )
+                {
+                    result.map( first_mapping.first, out_vertex );
+                }
+            }
+        }
+        return result;
+    }
+} // namespace
+
+namespace geode
+{
+    namespace detail
+    {
+        ModelGenericMapping merge_mappings(
+            const ModelGenericMapping& mappings1,
+            const ModelCopyMapping& mappings2 )
+        {
+            GenericandCopyMappingsMerger merger{ mappings1, mappings2 };
+            return merger.merge();
+        }
+
+        ModelGenericMapping merge_mappings(
+            const ModelGenericMapping& mappings1,
+            const ModelGenericMapping& mappings2 )
+        {
+            GenericMappingsMerger merger{ mappings1, mappings2 };
+            return merger.merge();
+        }
+
+        ModelGenericMapping copy_to_generic_mappings(
+            const ModelCopyMapping& mappings )
+        {
+            CopyToGenericMappings transferer{ mappings };
+            return transferer.transfer();
+        }
+
+        ModelMappings merge_mappings(
+            const ModelMappings& mappings1, const ModelMappings& mappings2 )
+        {
+            ModelMappings result;
+            result.component_mapping = merge_mappings(
+                mappings1.component_mapping, mappings2.component_mapping );
+            result.mesh_element_mapping.corners =
+                merge_element_mappings( mappings1.mesh_element_mapping.corners,
+                    mappings2.mesh_element_mapping.corners );
+            result.mesh_element_mapping.lines =
+                merge_element_mappings( mappings1.mesh_element_mapping.lines,
+                    mappings2.mesh_element_mapping.lines );
+            result.mesh_element_mapping.surfaces =
+                merge_element_mappings( mappings1.mesh_element_mapping.surfaces,
+                    mappings2.mesh_element_mapping.surfaces );
+            result.mesh_vertices_mapping.corners =
+                merge_vertex_mappings( mappings1.mesh_vertices_mapping.corners,
+                    mappings2.mesh_vertices_mapping.corners );
+            result.mesh_vertices_mapping.lines =
+                merge_vertex_mappings( mappings1.mesh_vertices_mapping.lines,
+                    mappings2.mesh_vertices_mapping.lines );
+            result.mesh_vertices_mapping.surfaces =
+                merge_vertex_mappings( mappings1.mesh_vertices_mapping.surfaces,
+                    mappings2.mesh_vertices_mapping.surfaces );
+        }
+    } // namespace detail
+} // namespace geode