It would be great if there would be a "Usages" options for BPS groups like it exists for the most other objects like Rules, Fields, Action Template, Data sources and so on.
I'm already using two workaround
1) I created a constant for each bps group so that I can use this constant wherever possible. Unfortunately there are some cases where this is not possible. For example in a "Person or group" field where the picker is limited to a group.
2) I added the "SearchAllTables" stored procedure to look for any occurrence of the BPS_ID of the group.
https://ignas.me/tech/searchalltables-sql-stored-procedure/
Note for myself:
I should add a second stored procedure which only searches through relevant tables.
Best regards,
Daniel