I have long wanted to make a two-part destruction using RBP, namely, an object is struck and breaks into two pieces which fall, hit the ground, and then each break into multiple smaller objects.
My solution works rather well, though it can be tedious. There may be a better way which may well be the Bullet Constraints Tools but I have had little success in managing the details. A short test movie can be found here. Does anyone know a better way?