@Mike9241 - in this case, the New Car manager would not be involved. This is the "Pre-Owned" Sales manager selling a pre-owned auto and buying (the trade-in) a pre-owned auto. The profit margin reported by the Pre-owned side of the house doesn't change.
bottom line is we can debate this all we want, but if the OP is successful getting the dealership to adjust the invoices, more power to him!
