I have an extruded thin feature & in a later feature I have a fillet.  I want the fillet radius to equal the thickness of the thin feature.  I know I've done things like this before, but it doesn't seem consistent on how to do this (or more likely my memory isn't consistent!).  I can double click on either feature, then find & select the desired dimensions.  If I double click on the dimension number, I get a "dumb" box that allows me to change the values only, I don't get that smarter dimension box that allows you to link.  If I single click the extension lines, I get the property manager of the dimension but there I can't figure out how to link them.  If you respond to this, please list ALL steps, not just "link them in the property manager" kind of explanations.  Thanks!!