I don't think this is possible in Milkshape unless you hide the group inside the model.
I have never gotten the hide mesh feature to work in milkshape for blockland.
You're gonna have to use Blender if you want to utilize this animation you have in mind.Milkshape is a dead program. I only use it because I fell in love with it at a young age, and she has my baby.
agh but BLENDERS REALLY GAYhonestly how the forget do people use it