Understanding QB Add-On

I want to make sure I understand this Add-On.  (I've already purchased it, but now it looks like it won't work for me.)  We use QB Enterprise Edition 2008.  All our customers (which are many) have their own account, organized by last name in QuickBooks.  Most of our customers are unique visitors.  My hope was that I could use the QuickBooks Add-On to import each customer and his order, so that I can use QuickBooks for printing invoices and for shipping - not ProductCart.  After reading the manual more closely, it appears that I cannot create an account for each customer.  Instead, I can only (relatively easily) import sales data to a generic customer account like "Online Sales?"  I think I am understanding this correctly, but just to make sure: If I have 50 unique customers a day, will I have to manually enter each customer, and then "map" each order to the manually created customers?  (I understand that QB does not recommend the use of .iif files anymore. I also understand that EI does not recommend the use of the Add-On with Enterprise, but I learned that too late to do much good.)  It just looks like I wasted my $ on the Add-On.  Do I understand everything correctly?