In the Lead process if the BP wans wants to sale his own vehicle, user selects from Menu Action Buttons Actions>>Trade In>>Add Trade in Vehicle
User completes popup window with following mandatory fields:
- Make: Drop down List - The Make of BP's vehicle
- VIN: Alphanumeric- The VIN of BP's vehicle
- Mileage: Integer Number - The miles of BP's vehicle
- License Number Number: Alphanumeric- The License Number of BP's vehicle
- Calculated TradeIn price: DecimalNumber - The price of BP's vehicle
The user selects the 
button to add a TradeIn vehicle to lead.
The Trade In details can be found on the Trade In tab.
For more details, please refer to this page: Add Trade-in