To take a trade in tranasction:

•  Start a customer order or cash and carry register transaction:

For a register transaction be sure to add a customer (don’t use the walk in customer). 

• Check the item and In the action menu->Items click on "Trade-In"
• Create a product record for the item being traded in – creating the trade in item will also create a stock adjustment for this item – using the reason code ‘Trade In’. You can add a serial number as you create the trade in item – or wait and add it in the adjustment.
• If this is a regulated item an acquisition can be started from the edit adjustment screen. A link to this adjustment will placed in the notes of the customer order or register transaction.

• The product cost you enter on the trade in item will generate a customer credit in that amount. For the retail price of the trade in item – enter what you hope to get when you resell it. You can always change that in the future. You can also adjust the cost later to account for the cost of any repairs or cleaning. For now, though enter the cost as the amount you are paying to the customer trading in the item.

• If this is a register transaction the store credit will automatically be applied to the transaction – if this is a customer order – you will be alerted that there is a store credit belonging to the customer when you click on the ‘Collect Payment’ button. In both cases you can use ‘Cash Back’ to give the customer cash or partial cash back for their trade in.

• Add any additional items or services to be purchased to your receipt or customer order and carry on as you would for any other transaction.