Subcontracting - but we do not receive the finished good back

SUGGESTED

I'm wondering if any other customers have a process similar to this situation.  We are sending materials to a subcontractor, where the subcontractor maintains a Kanban.  We still own the materials, so we need to keep track how much is at the subcontractor's location.  They are going to assemble the materials, and then send the finished goods to the end customers for us.  What is the best way to set up a location, "send" materials there, consume the raw components, but not receive a finished good back.