I did find a way to do it...it requires extra classes, though, so it may not be worth it.
Ok, say you want the enemy to have 2 hitpoints.  I call the one with 2 monster2, and give him a class of monster 2(make sure it's A in the collisions.)  Then, when you make the collisions, create a monster 1 in place, with a new class, and so on and so forth.
Like I said, it may not be worth it....