Auto Re-logging & Simultaneous Stillage?

Good day, I need advice about a planned sale. A neighbour of mine wants to buy a car (4000 €) but not directly register it but leave it in the yard. I currently do not need the car and it has been around for a while. How does it work at the registration office. Can you rewrite the vehicle owner (sale) and then log it off at the same time or have to log it off first and then the neighbor can rewrite it. As mentioned, the neighbour wants to be currently does not kill it and therefore does not want to register it directly.