hey! If I understood you correctly , you have 1 Shopify store, but your
inventory and shipment come from 4 warehouses (4 lcoations) and they all
have 1 ship from location, but you want each shipment to show which
warehouse it was shipped out from? Is...
I think first you would want to create some automation rules to assign
box sized to different skus. and then you would want to edit your
packing slips to have the box sizes showing.