Containers are kind of limited in that situation - you can't destroy only one object in container because destroying one will destroy whole conteiner.
viking78 will You use Spriter for animations only or with spriter C2 plugin to anmate them in C2?
I'm not sure how Spriter plugin will behave if one or few of the objects used in animation are destroyed (@lucid will animation for others part continue?).
For chopping body part You could use bullet behavior with gravity - to shoot them a little upward and slowly fall to the ground.
For that you can either destroy and create new sprite with bullet or activate bullet for currently chopped part - again not sure how this will behave with spruter plugin.