Subcontract Op without Shipping

We have Raw Material that we bring in as inventory. We want to be
able to create a PO for a Vendor to perform an operation for this
material without having to ship it out, and also to retain it's Lot
Number in our Inventory. Basically we need to Just move it to a
warehouse that Indicates it is being processed, and then accumulate the
cost of that process to the job and linked to a PO.
Any Ideas?