Okay, I still don't know how to work the History, but I did find a workaround. Unfortunately, with the smoothed character, Maya was crashing every time I went into the attr. editor. So I figured out how to add a button to the shelf with a script that would lower the divs to 0 without having to open the attr editor. So it's working! And now I have nice little buttons for divs 0 through 3.
It's nice when a potential problem turns out to be a wonderful learning experience.
Thanks for help!