You create an entirely new skeleton in the animation pack. It's default animations are based on whatever skeleton you copied. Then you edit the animations (replacing them) with whatever you made in 3DSMAX. Since this is a new skeleton, it doesn't overwrite other existing skeletons.
There's a tutorial in Scriptorium section of this forum. Making new skeletons is pretty simple and easy. So's updating it with new animations you've made. Making the animations themself is a huge PITA.
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