I use Maya but I believe the same method should be possible with 3dsmax. Create three separate chains for your setup. (names are just for illustration) Deform (Thigh, Shin, Foot, ...) - This deforms your character IK (IK_Thigh, IK_Shin, IK_Foot, ...) - Do your reverse foot and IK on this one FK (FK_Thigh, FK_Shin, FK_Foot,…