There are different options when dealer transferring a vehicle.
Please see below.
Dealer Transfer when vehcile is a fully paid unit
If the vehicle has been paid for and has a purchase invoice posted against it, it will need to be sold to the transferring dealer and this can be flagged as a Trade sale. This means you can then remove from your retail trade units for composite purposes
Dealer Transfer when there is a PDI/Prep cost
The easiest way if to credit the job back to the stock record and ask Service to invoice off the PDI/Prep to the transferring dealer.
If no cost being pasted on you will need to ask Service to credit PDI/Prep back off the vehicle and then re-invoice to an internal Sales Ledger Account.
Costs will still need to be assigned to bring the SIV back to Zero.
Then the following steps can be followed:
Go into the stock record and select Dealer transfer
Transfer box will appear for you to enter the Dealer Details of where the vehicle is going to.