I'm struggling here for some time now, and started to loose the hope this is actually possible in Revit.
Basically I'm trying to build the family, 2 folding arms, one shorter than another. I want it to automatically change all the angles when the total length of the component changes. Because I have the arm lengths as the only given, fixed data, I can't figure out how to make it work. Any ideas how to resolve it, or maybe any of you seen similar Revit family done so I can have a look?
I tried to use the percentage value (if 340 is 100%, then 200 is x%), but for some reason it doesn't come out accurate, so I'm totally lost