There is no wizard for it. It should just be a matter of showing multiple rows using the repeat selection server behavior and then applying the multiple update server behavior.
This is something that I could help with in a premier support ticket, or if you give it a try I can help you debug the page you are working on and give you tips on how to fix it yourself. (I'd need FTP access and a url to see the page your are working on if you go this route)