Retained Earning Account for a Legal entity with multiple operating units

Hi,

My client has a requirement of one legal entity with multiple operating units. When I'm setting up a ledger(associated with that ledger), the accounting options only allows one balancing segment to be entered in retained earnings. The P/L statements would be accounted operating unit wise every month. Now if I chose one of the multiple balancing segments in the retained earnings account, I'm not satisfying my client's needs w.r.t. P/L reporting.

Please help me how'd I default my retained earnings account combination to all the balancing entities in a legal entity while setting up the ledger.