You can use data-assist and multiple update to show a list of all of the categories in their current order and let them update the fields in the order column to adjust the order.
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.