web[4]iran

Hello, I want to try WHMCS, we are switching to billing software from simple paper billing. We have customers from pas 5-6 years and I have to generate all invoices from year 2005, and then mark them paid keeping track of our contracts with customers. Is there a way to such work? For example I create a customer assigning a 50 MB package to him, its start date 01/01/2004, and WHMCS (trial) generates just an invoice for next occurring date. but I want it all of the invoices they had in last 5 years to mark it paid or unpaid. Is it possible ? Best regards Ahmed