Dynamically modify a movieclip

hi ,
:megaman:
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 :bucktooth: