Look into the following programs to see if they can help you:
RSMRM_ODS_DATA_DELETE
RSAR_ODS_DATA_ASYNCH
RSDRI_ODSO_DELETE_RFC
If none of them work for you, I believe the best approach for you would be to write a simple ABAP Program which allows you to have a better control on what data you want to delete from the specific object.
Hope this helps.