I have a model that is basically a rod with a tapered thread on one end, a larger, straight thread on the other, and in the middle is open space the diameter of the straight thread minimum.  The model changes diameters/lengths with each configuration.  When I try to add another configuration and change a linked dimension, it changes that dimension in other configurations.  I've tried unlinking to no avail.  There are equations in use but as far as I can tell all they do is assign sizes to named dimensions in each configuration.  The formulas are greyed out so I can't select and delete them.  Any ideas?