diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/billing.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/billing.json
index 65048a244a9f..2042daec260a 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/billing.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/billing.json
@@ -3460,6 +3460,150 @@
         }
       }
     },
+    "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/createBillingRoleAssignment": {
+      "post": {
+        "tags": [
+          "BillingRoleAssignments"
+        ],
+        "operationId": "BillingRoleAssignments_AddByBillingAccount",
+        "description": "Adds a role assignment on a billing account. The operation is supported for billing accounts with agreement type Microsoft Customer Agreement.",
+        "x-ms-examples": {
+          "AddRoleAssignmentToBillingAccount": {
+            "$ref": "./examples/AddRoleAssignmentToBillingAccount.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/billingAccountNameParameter"
+          },
+          {
+            "name": "parameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/BillingRoleAssignmentRequestProperties"
+            },
+            "description": "Request parameters that are provided to the create billing role assignment operation."
+          }
+        ],
+        "responses": {
+          "201": {
+            "description": "Role assignment is successfully created",
+            "schema": {
+              "$ref": "#/definitions/BillingRoleAssignment"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
+    "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}/invoiceSections/{invoiceSectionName}/createBillingRoleAssignment": {
+      "post": {
+        "tags": [
+          "BillingRoleAssignments"
+        ],
+        "operationId": "BillingRoleAssignments_AddByInvoiceSection",
+        "description": "Adds a role assignment on an invoice section. The operation is supported for billing accounts with agreement type Microsoft Customer Agreement.",
+        "x-ms-examples": {
+          "AddRoleAssignmentToInvoiceSection": {
+            "$ref": "./examples/AddRoleAssignmentToInvoiceSection.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/billingAccountNameParameter"
+          },
+          {
+            "$ref": "#/parameters/billingProfileNameParameter"
+          },
+          {
+            "$ref": "#/parameters/invoiceSectionNameParameter"
+          },
+          {
+            "name": "parameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/BillingRoleAssignmentRequestProperties"
+            },
+            "description": "Request parameters that are provided to the create billing role assignment operation."
+          }
+        ],
+        "responses": {
+          "201": {
+            "description": "Role assignment is successfully created",
+            "schema": {
+              "$ref": "#/definitions/BillingRoleAssignment"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
+    "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}/createBillingRoleAssignment": {
+      "post": {
+        "tags": [
+          "BillingRoleAssignments"
+        ],
+        "operationId": "BillingRoleAssignments_AddByBillingProfile",
+        "description": "Adds a role assignment on a billing profile. The operation is supported for billing accounts with agreement type Microsoft Customer Agreement.",
+        "x-ms-examples": {
+          "AddRoleAssignmentToBillingProfile": {
+            "$ref": "./examples/AddRoleAssignmentToBillingProfile.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/billingAccountNameParameter"
+          },
+          {
+            "$ref": "#/parameters/billingProfileNameParameter"
+          },
+          {
+            "name": "parameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/BillingRoleAssignmentRequestProperties"
+            },
+            "description": "Request parameters that are provided to the create billing role assignment operation."
+          }
+        ],
+        "responses": {
+          "201": {
+            "description": "Role assignment is successfully created",
+            "schema": {
+              "$ref": "#/definitions/BillingRoleAssignment"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/agreements": {
       "get": {
         "tags": [
@@ -6026,6 +6170,19 @@
         }
       }
     },
+    "BillingRoleAssignmentRequestProperties": {
+      "description": "The request parameters to add the role assignment on a scope",
+      "properties": {
+        "principalId": {
+          "description": "The user's principal id that the role gets assigned to",
+          "type": "string"
+        },
+        "roleDefinitionId": {
+          "description": "The role definition id",
+          "type": "string"
+        }
+      }
+    },
     "BillingRoleDefinitionListResult": {
       "description": "The list of role definitions.",
       "properties": {
diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToBillingAccount.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToBillingAccount.json
new file mode 100644
index 000000000000..8141ec0ad1fc
--- /dev/null
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToBillingAccount.json
@@ -0,0 +1,28 @@
+{
+  "parameters": {
+    "api-version": "2020-05-01",
+    "billingAccountName": "{billingAccountName}",
+    "parameters": {
+      "principalId": "00000000-0000-0000-0000-000000000000",
+      "roleDefinitionId": "{roleDefinitionId}"
+    }
+  },
+  "responses": {
+    "201": {
+      "body": {
+        "id": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingRoleAssignments/10000000-aaaa-bbbb-cccc-100000000000_6fd330f6-7d26-4aff-b9cf-7bd699f965b9",
+        "name": "10000000-aaaa-bbbb-cccc-100000000000_6fd330f6-7d26-4aff-b9cf-7bd699f965b9",
+        "properties": {
+          "createdOn": "2018-06-21T21:34:12.2363515+00:00",
+          "createdByPrincipalTenantId": "7ca289b9-c32d-4f01-8566-7ff93261d76f",
+          "createdByPrincipalId": "10000000-aaaa-bbbb-cccc-3fd5ff9d6aa1",
+          "principalId": "00000000-0000-0000-0000-000000000000",
+          "scope": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}",
+          "principalTenantId": "10000000-aaaa-bbbb-cccc-2d7cd011db47",
+          "roleDefinitionId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingRoleDefinitions/50000000-aaaa-bbbb-cccc-100000000002"
+        },
+        "type": "Microsoft.Billing/billingAccounts/billingRoleAssignments"
+      }
+    }
+  }
+}
diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToBillingProfile.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToBillingProfile.json
new file mode 100644
index 000000000000..33fc83cd034d
--- /dev/null
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToBillingProfile.json
@@ -0,0 +1,29 @@
+{
+  "parameters": {
+    "api-version": "2020-05-01",
+    "billingAccountName": "{billingAccountName}",
+    "billingProfileName": "{billingProfileName}",
+    "parameters": {
+      "principalId": "00000000-0000-0000-0000-000000000000",
+      "roleDefinitionId": "{roleDefinitionId}"
+    }
+  },
+  "responses": {
+    "201": {
+      "body": {
+        "id": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}/billingRoleAssignments/10000000-aaaa-bbbb-cccc-100000000000_b1839933-b3ac-42ca-8112-d29c43f3ab47",
+        "name": "10000000-aaaa-bbbb-cccc-100000000000_b1839933-b3ac-42ca-8112-d29c43f3ab47",
+        "properties": {
+          "createdOn": "2018-06-21T21:58:19.9073876+00:00",
+          "scope": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}",
+          "createdByPrincipalTenantId": "7ca289b9-c32d-4f01-8566-7ff93261d76f",
+          "createdByPrincipalId": "10000000-aaaa-bbbb-cccc-3fd5ff9d6aa1",
+          "principalId": "00000000-0000-0000-0000-000000000000",
+          "principalTenantId": "10000000-aaaa-bbbb-cccc-2d7cd011db47",
+          "roleDefinitionId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingRoleDefinitions/50000000-aaaa-bbbb-cccc-100000000002"
+        },
+        "type": "Microsoft.Billing/billingAccounts/billingProfiles/billingRoleAssignments"
+      }
+    }
+  }
+}
diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToInvoiceSection.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToInvoiceSection.json
new file mode 100644
index 000000000000..662c68878d7e
--- /dev/null
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2020-05-01/examples/AddRoleAssignmentToInvoiceSection.json
@@ -0,0 +1,30 @@
+{
+  "parameters": {
+    "api-version": "2020-05-01",
+    "billingAccountName": "{billingAccountName}",
+    "billingProfileName": "{billingProfileName}",
+    "invoiceSectionName": "{invoiceSectionName}",
+    "parameters": {
+      "principalId": "00000000-0000-0000-0000-000000000000",
+      "roleDefinitionId": "{roleDefinitionId}"
+    }
+  },
+  "responses": {
+    "201": {
+      "body": {
+        "id": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}/invoiceSections/{invoiceSectionName}/10000000-aaaa-bbbb-cccc-100000000000_6fd330f6-7d26-4aff-b9cf-7bd699f965b9",
+        "name": "10000000-aaaa-bbbb-cccc-100000000000_6fd330f6-7d26-4aff-b9cf-7bd699f965b9",
+        "properties": {
+          "createdOn": "2018-06-21T21:34:12.2363515+00:00",
+          "scope": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}/invoiceSections/{invoiceSectionName}",
+          "createdByPrincipalTenantId": "7ca289b9-c32d-4f01-8566-7ff93261d76f",
+          "createdByPrincipalId": "10000000-aaaa-bbbb-cccc-3fd5ff9d6aa1",
+          "principalId": "00000000-0000-0000-0000-000000000000",
+          "principalTenantId": "10000000-aaaa-bbbb-cccc-2d7cd011db47",
+          "roleDefinitionId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingRoleDefinitions/50000000-aaaa-bbbb-cccc-100000000002"
+        },
+        "type": "Microsoft.Billing/billingAccounts/billingProfiles/invoiceSections/billingRoleAssignments"
+      }
+    }
+  }
+}