Product allocation

Guys,

I am asked to do product allocation at customer heirarchy 4 and 5 levels. the sales order created for level 4 and 5 customers should be populated in gatp planning area in sales order quantity field to calculate open allocation which is done at 4 and 5 levels

i have done this for ship to and sold to successfully. But when we talk abt 4 and 5 levels there will be many customers in a level. Will the sales order for these levels can be transferred to GATP planning area? Pls confirm

Thanks

Shruthi