Returns on Paid Invoices

If I have a customer who has a paid invoice but then decides to return an item, what is the best way to do it? Is there a better way than to just edit the invoice and delete the item? Is there a way to track returns?

Good accounting practice requires that you never delete a record or edit it after the fact. In the event of a dispute, which is much more likely since the customer already wants to return the item, you would have no accurate record of the original transaction.

best way to sales return is issuing credit note to specific customer

See: http://guides.manager.io/businesses/sales-invoices/handling-customer-returns