Dynamically modify a movieclip

[dragonair]

hi ,

i m working on a game where player has to demolate a bulding by placing bombs at diff places .. i want to know how break a movieclip into multiple parts dynamically ... like in the game demolition city ... i want the movieclip to be brocken into parts when detonated and then apply physics to the so created small movieclips and make the fall on the ground ... please tell me the concept and coding .. asap