OK. I have part with configuration "Base" I want to have three configurations based on the features in "Base". I add configurations "A", "B" and "C". So I create "Base" and then add A, B and C. The problem is that when I do this all the features I add in A show up in it's siblings (B/C) and vice versa. It is tedius to add features and then have to go to all the previously existing configurations that are siblings and supress/hide them.

What an I doing wrong???