How to pull inventory from a specific storage location

Hi guys,

I wonder how can i determine which storage location should we pull the stock from ... We have a plant, warehouse and a storage lcoation (XX01) and now i need to create another storgae location (XX02) for the same plant warehouse... now when i create the order system pulls the componenets from same old storage location (XX01)... even though i have inventory in the new storage location ....can somebody guide me how to pull from new storage location. Thanks much