Add mass change docs

docs/user/subscriptions/mass_change.md

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+---
+title: Mass Change Subscriptions
+sidebar_label: Mass Change
+sidebar_position: 7
+---
+Mass changing subscriptions is a common task that companies need to need infrequently.
+
+## Permissions
+
+To be able to create subscription for a customer via the BillaBear admin system you will need to have a ROLE of Account Manager or higher.
+
+[Check the user roles here.](../user_roles/)
+
+## How it works
+
+To do a mass-change of subscriptions you select the criteria for which subscriptions you want to have changed. The criteria include Plan, Price, Brand, and Country. 
+
+You're able to set new values of Plan and Price.
+
+When you change a price you'll be told of the change to the MRR.
+
+## How To
+
+### 1. Click Subscription
+
+![Click Subscriptions](./mass_change_screenshot/1_click_subscriptions.png)
+
+### 2. Click Mass Change
+
+![Click Mass Change](./mass_change_screenshots/2_click_mass_change.png)
+
+### 3. Click Create
+
+![Click Create](./mass_change_screenshots/3_click_create.png)
+
+### 4. Select Criteria
+
+![Select Criteria](./mass_change_screenshots/4_select_criteria.png)
+
+### 5. Select new Value
+
+![Select new value](./mass_change_screenshots/5_select_new_values.png)
+
+### 6 Select Change Date
+
+![Select Change Date](./mass_change_screenshots/6_select_change.png)
+
+### 7. Click Submit
+
+![Click Submit](./mass_change_screenshots/7_click_submit.png)
+
+### 8. View Details
+
+![View Details](./mass_change_screenshots/8_click_mass_change.png)