Thank you all for your replies. But maybe I wasn't clear enough. I know how to create hierarchies, and I've created quite a few so far and they are functioning well. My question was more of "do I use Insert characteristic context menu option right" nature. I was under impression that if I insert 0MATL_GROUP characteristic in 0MATERIAL hierarchy and select any material group that hierarchy will group individual materials together according to selected material group. Since, 0MATL_GROUP is attribute of 0MATERIAL infoobject.
Since obviously I'm wrong here, can anyone give me proper example on how to use "Insert Characteristic" in hierarchies.
Thanks