OK, On the ccart page, you need to replace the quantity text box with an eCart updateable list.
remove the existing quantity filed in the cart display, then go to Insert -> ecart -> Updateable List, set the cart column to quantity.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.