Default Intermediate Location in a 2 Stage Transport

Hi,

I have created a 2 stage FWO type, which will have 2 legs of transportation.

Location A -> Location B & Location B -> Location C.

Location A & C can be anything, whereas Location B will always be the Warehouse.

How can we default Location B alone  to a particular location.

SAP TM 9

Thanks in advance,

Deepan Mahendran.