Found it!
Thanks - More poking about and I found that in the data assist wizard, under Manage Pages, click on Configure Field Settings. The field type can be changed there.
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.