Vins are preselected. Some dealership order a cars with xyz and it falls on vin number 123. Vin 123 has been previously selected. It's not a car, it's just a Vin. That Vin would then not be assigned to dealership. Instead, that Vin is pulled. The car is still built but the computer doesn't ship it. Instead, another car is built the same way with a subsequent Vin to be sent the dealership.
This isn't rocket science and I'm sure that Ford and the NTSB (or whomever is pulling the strings) could figure out pretty easily. We sent men to the moon in the 70s.
This is the kind of thing that I'm currently taking classes for. The way that databases are built these days, makes it much easier to do. Data is independent of the actual application that processes it all. You can use the same data and run it through lots of different/separate ringers (applications) to make use of it.
Its on the train... I'll have it next week barring any train derailment or similar catastrophic event. The dealer will be working with me on the cost as well. I was close to driving from NJ to Ohio to pick on up at another dealer last week.