Add Members to a Collection (Master Data Services)
Applies to: 
SQL Server - Windows only
Azure SQL Managed Instance
In Master Data Services, you can add leaf and consolidated members to a collection.
Prerequisites
To perform this procedure:
You must have permission to access the Explorer functional area.
You must have a minimum of Update permission to the collection model object that you are adding members to.
A collection must exist. For more information, see Create a Collection (Master Data Services).
To add members to a collection
On the Master Data Manager home page, from the Model list, select a model.
From the Version list, select a version.
Click Explorer.
From the menu bar, point to Collections and click entity_name.
In the grid, click the row for the collection you want to add members to.
Click the Collection Members tab.
Click Edit Members.
To filter the list of available members, select from the list on the left.
Click the row with the member you want to add and click Add.
Optionally, rearrange collection members by clicking Up or Down.
Optionally, set weight values by clicking the value in the Weight column.