i did something similar, but don't know if it would work for you. i use milkshape3d (which doesn't really do the whole parent/child thing). the only 'children' that blitz3d will recognize from a model made in ms3d are the joints. so what i do is make a lone joint and then assign the verts of that model part to that joint, and then when i look for the child in blitz3d it will find the joint as a 'child'. weird, huh? anywho, i can place the joints to make the parts rotate on the axis i want. like i said, don't know if that will help, but thats all i got.
EDIT: or better yet, make a model joint(or tiny cube or something) as another child where you want the axis to be. then when you load the model in make that spot a pivot and then remove (or hide?) the model part (if it was a cube). would this even be worth it?
EDIT: or better yet, make a model joint(or tiny cube or something) as another child where you want the axis to be. then when you load the model in make that spot a pivot and then remove (or hide?) the model part (if it was a cube). would this even be worth it?