Mark estimate as invoiced

Sometimes we will send an invoice to a client and they will ask that we provide an estimate as well. Since the invoice has already been generated, there is no need for us to create a new invoice from the estimate. Can there be a way to mark an estimate as invoiced so that the estimate is moved from the approved to invoiced list? This would be similar to the "Mark as Sent" feature where we can mark an invoice as sent. The system didn't actually send the invoice.