External Storage units to be entered in the Creation of Transfer Order

Hi Experts,

We have a scenerio where the business creates the Storage units in advance, creates the PO and assigns ithe SU's to the Purchase Order in the custom table. Then creates the Goods reciept using a BAPI which creates a Transfer requirement. Now while creating the Transfer Order for this material document ,

The main issue here is that the businedd needs that if there are any number of Storage units in the Custom table say 3 SU's then the 3 SU's should be entered in the Transfer Order which is created in the bcakground using a BAPI.

please guide us how todo it

Thanks in advance