I don't know. The industry scripts that I've worked with hard coded the amount to request in the waybill. Usually it is a % of the product queue size so they're be room to load the full amount when it arrives. It could be programmed otherwise with user input allowed within certain limits. My guess is that if the industry were configured to allow this it would have to be something you change in the industry's properties setup in Surveyor.
Maybe somebody will reply who knows something more definite.
Bob Pearson