The Shipping Warehouses program allows you to change the ship via for any warehouses on an order. You can access this program from the View-->Shipping Warehouses menu option in Order Entry or SO Document Inquiry (view only mode).
You can also change the warehouse level Ship Complete setting, except for credit memos. This is the only place where the ship complete can be changed for a warehouse that is not the initiating warehouse.
You can select Chng Ship Via to change the ship vias for all existing lines for a particular warehouse.
You can select Ship Comp to enter a new ship complete status for the specified warehouse. Refer to the Ship Complete Feature Overview topic for details.