When selling a Unit the system will then prompt at the end to ask if there is a Trade-in.
If you answer Yes you can select the unit to take as a Trade-In (or create a new unit if you have not previously sold it or had it in a a Job).
Enter the buying price and confirm the Tax rate.
If you have a rough idea of the selling price and minimum price it is a good idea to enter it now to save you having to go back in later and change it.
If there is a settlement to be paid out on the trade-in enter the finance company name and the balance owing.
If you need to take additional Trade-In's select he Trade-In option from the Options menu.