We are a Vehicle Processing Center (VPC) located at the port of entry for vehicles shipped directly from the manufacturer.

We are using Odoo to help us manage our inventory of Port Installed Options (PIO) - safety stickers, front license plate brackets, compliance plates, warning triangles, first aid kits, manuals, warranty cards (in the local language), floor mats (carpets), and legally required accessories after a car has been imported but before it reaches the dealer.

We are manually creating Delivery Orders and Receipts with the expected number of vehicles that are planned to be shipped in and out but often this number changes.

If the number increases, we can create easily add another line with the difference, but if the number decreases, we have no easy way to modify the demand.

How can we edit the demand of confirmed (ready) delivery orders and receipts?