End-of-life vehicle to dealer, transfer registration plate to new vehicle.

Hello people , I need some help !. The following problem : I bought a vehicle from a dealer at 120km distance and would like to keep my license plate . I would have to bring my old vehicle to the dealer on the pick-up day ( give in payment ) , but would like to keep my old license plate . For the trip to the dealer must have the “old vehicle ” a license plate . How do you do this best ? . Thanks in advance