Catalook Upgrade

We use catalook webstore software on our sales portal. It has already been modified by us (employee now left) and we need some further modifications to it. Essentially we need to allow our customers to register on the DNN website, go to their own page and store information, line by line and add files for each line. We then need this customer to be able to press a button and have the part, file and price all added to the catalook shopping basket. We also need the database modifiying to allow different portals to have access to the core database with their own languages / prices. This is a significant project, a formal user requirement specification will be written from the outset. Only people with demonstratable experience will be considered, references to previous work will be required. The project will commence in February.