Yes - you can show what you like in the footers. You may have to unlock the structure (padlock button) in order to drop the relevant text or calculation etc into the footer. If you wanted to show a total of detail values, for instance, drop in a calculation with the expression total([your item] for [your grouped item]) for a droup footing, or total([your item] for report) for an overall total.
Regards,
MF.
PS - remember to tre-lock the structure once you have finished!