[Zope] retro-fit zClasses with ObjectManager base class

Hi all. I am new to Zope and trying to follow the subclass thread...it seems to relate to my current problem. So I was hoping to get some advice to what I think is a more basic issue. I am in a project using many zClasses and now need to add images to them. However, I did not set them up with ObjectManager. Is there a way to add ObjectManager to an existing zClass? If not, is there a shortcut to import all the data from the existing zClass to the new zClass(with images)? Thanks for the help. -Trevor Toenjes