It's successful for me to load a hole making type and cavity mill type operation after I grouped the features. But for Z Level type and mill planar type operation I was failed to do that? So what kind of feature should I teach for?
It is not entirely clear to me what you are trying to do.
Are you teaching operation sets ?
Are you trying the ootb machining rules ?
Can you provide a part please and a short description.
Your NX version is important to know too.