Duplex, going by what you have said you are trying to achieve,I assume you want the model to 'fall apart'.
There are only three ways I can think of to do this,
1.You need to animate the model.
2.You would have to use a lot of smaller parts to build the complete model in the scene and use physics.
3.You could 'explode' the model,but this would send pieces of the model in all directions,it may work better if gravity was high on the model,tho' I haven't tried this myself.
There may be an easier way but most models,even animated ones,are actually one complete mesh when exported to .x.
