How can I separate New inventory and Used inventory on different invoices?

This is helpful if you have more than one rooftop to service for a dealership. 1.Service all the lots. 2. Open the Invoice Screen 3. Right-click or hit context menu key when on the price cell of a NEW vehicle then choose "Assign This Item To Next Invoice". 4. Continue until all NEW vehicle invoice items are moved. 5. Print out invoice for Used Vehicles. 6. Close "Print/Edit Invoice" then bring it up again and all the NEW vehicle items should be listed.