Materials and Multiple Warehouses

On our Epicor installation, we currently have one site with multiple warehouses.

We have parts in different warehouses that are used in manufacturing methods, but all the manufacturing is done in one warehouse.

I’m trying to figure out how to set the warehouse for PO suggestions to default to the primary stocking warehouse, but have the job materials default to the warehouse where it is manufactured.

It seems that both are driven by the primary warehouse set up for the part. I can’t find a way to change this behavior.

What’s the best way to accomplish this?

Our installation is on version 10.2.300.12.