Sales from on-line inventory must be logged on TL: It is the only way to remove a vehicle from the database of vehicles.
Check the right-most box, Select, of the vehicles to be sold
Click Sold at the top of the page
Type the sale price (noted in red on the illustration below). Sales amount entered is expected to be "net of over allowance"
Select a currency type
Click Sell Trucks to mark your vehicle sold.