Stock transfer order

Hi all

My client is Having a 5 Division, 2 DC, one sales org and 9 plants

the stock transfer happens all the 9 plants and its can be any plant to any plant . they all trading plant .

we thought of going for 1 division so that it will be easy Stock transfer, and make the 5 division in to 5 sales group so tat we can make sto easy . but since the client want to lot of reports and control goin for 5 sales group is not possible solution so have to go back to the 5 separate divsion so in case goin for 5 division. so think it will complicate the STO configuration since only one sales area can be assigned for one plant but since the sto happens between all the plants i not sure how to config it i got 5 different division .

hope there must be some solution can any one please help any idea would be very helpful

thanks