hi pavan
There is a SAP delivered report that you can copy, remove the system type check and run. To do a landscape with delete, enter the roles to be deleted in a transport, run the delete program or manually delete and then relase the transport and import them into all clients and systems.
It is called: AGR_DELETE_ALL_ACTIVITY_GROUPS.
To used it, you need to tweak/debug & replace the code as it has a check that ensure it is deleting SAP delivered roles only. Once you get past that little bit, it works well.
best regards
MOHAMMED ABDUL MUQEET