Question:
I want to delete a large number of activity groups that are no longer used.
Is there an easy way to do this?
Answer:
THere is a report SAP provides but it is not for customer use, you would have to copy the code and remove the SAP only check.
Futher is you intend to delete the roles in all systems place the ones to be deleted in a transport, delete the roles and THEN release the transport, when you transport it in the target system the roles will get deleted.