Cross Business area Transactions bettween two Business area in Classic GL

Dear experts,

we are not in new GL and we are still in Classic G/L and we have two business areas where we are doing cross business transactions and clinet want tallied trail balance of each month.

How can we achive the above situtaion. I know new G/L where systeom will take care for tallied trail balance by using Zero balance clearing account.

Thanks Reagards,

Bramhaiah