Balance transefer from Bus area to Bus area in fc

Hi... Friends  i have one requirement .. i want to transfer Balance from one Business Area to an Other Business Area in FC. in that some additional configuration needed.

for ex:-    customer a/c DR    9200 $    Bus Area is 51

                         to customer  8000 $    Bus Area is 20

                         to customer  1000 $    Bus Area is 15     will be like this, but DR / CR   Balances is not matching  but i want that difference Balance should get posted automatically.  to separate GL account. is it possible if yes pls guide me..