Can P3121 view multiple branches?

We have two physical branch/plants where our inventory is stored; however we keep them as one branch in JDE.  One is a manufacturing branch and the other is essentially storage.  Because of the distance and the physical address differences, we are toying with the idea of separating the branches.

One of the biggest drawbacks is visibility in the Parts List Inquiry screen.  Since the majority of the inventory will be at the storage location, the available quantity is almost always negative.  We'd like to be able to utilize multiple branches for the on-hand quantity.

Is it possible to consolidate two branches or is there another screen available that would allow us to do this?