Yes, for bulk changes, we recommend that you work with the Audience Manager APIs instead.
We have REST APIs for bulk operations which you can perform from Postman API tool or through curl. Another option is using Audience Manager swagger API tool: Adobe Audience Manager API Docs.
Hope this will help in performing operations in better way.
We are trying to Upload via BAAAM tool but it is not supported , however REST API documentation of doing the uploads is not clear , Can you please tell us with an example.