After I get my proposal funded and a budget or account number is assigned by GCA, what do I do to transfer the funds to the Subcontractor?

Don't delay. You normally want the Subcontractor to start at the same time UW does, so initiate a new Blanket Purchase Order (BPO) in Ariba. The object code for subawards is 03-62. Note: you cannot budget or account share with a subaward.