Per my dealer, there is no build priority, which pretty much ticks him off. He agrees sold orders should be priority over dealer stock but that is not the way it is. I have spoken to three different dealers and have been told the same thing, and none of them like it one bit. The reasoning is they would have to dedicate a line to build customer orders as not many are exactly the same. This slows down production so it is not feasible. Your vehicle gets put in the queue and when the parts are available it gets in the build line and a hard schedule (D1) is set. Once D1, you can't make changes.
As stated 99 means employee order. Nothing more, nothing less