Kim,
It would be hard for me to say without seeing the plants/pots. Are they such that they have multiple stems that could be pulled apart? Or are they branching from the same underground main stem, and would need to be broken off?
Having asked that, I think that these plants could be divided in either case. Knowing the grower that you are, I am sure you could pull it off easily. I had one of these that (I hate to admit) stayed in a turned over pot, under a tree, neglected for 6-8 years, and it just kept growing.
if you take cuttings, I would say you can almost just lay these on the ground. In other words, don't plant to deeply. I have rotted some of my favorite philos by giving them too much wet soil.