[GNC] How to display account total with subaccounts in a report

[Jediator]

The P&L report for instance displays the account hierarchy and the 
account balance for each account.  However, all parent accounts show 
zero balances.  Is there anyway to display the account balance of a 
parent as a sum of all its child accounts?

This may have been asked before, but I searched the mailing list archive 
but couldn't find any answer for this.

Thanks a lot! -- JC