Aging Reports at Party Level?

Client wants to have one party one account mapping but then want to see Aging Report for several related customers together in one report with one outstanding balance.

I explained that it is feasible if you have one party and then create multiple accounts under it for related customers, you can get Standard Aging Report to show Aging.

This will work in Collections as well but somehow the requirement is to have different parties but reporting requirement is to consolidate balances of few related customers.

Is that feasible, without any customization or custom report in AR?

Thanks,...