hmm..I've done mine in the OS, I don't think I know of a way to do it in Bryce. In the Materials Folder, copy/rename the user.mat file with a name that works for you (such as metals.mat), for each category you want. Then, when you pull up Bryce, and look in the User section of materials, you should see the categories. If you go through the old materials, you should be able to add them to each category as you see fit. I've done it one at a time, but then I don't do it that often any more. Hope that helps.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)