Loop base members with parent results

Hi!

Wondering if it possible to build a report book that loops through a list of members, but aggregates results for a parent? If this is possible, how would you setup your loop? Can't seem to get it to work!

Example: report results show the total for BIP 1226, and output the same results in a separate report for B1226, B1344, B1489 and B1490 (ideally with these base entity names in the header).