How to attach one dynamic component to another

I’m trying to develop a dynamic component so that I can make a third without having to do manual calculations, I’ve already achieved almost everything, but the tip cannot distort so I made a single component with the measurements locked, my problem is that when I change the size of the Tuesday, the end doesn’t line up as it should, does anyone have an idea? it would be a command like an anchor to always follow the body of the third.
VIGA T.skp (2.4 MB)

What version of SketchUp are you actually using? Your forum profile says “Free Plan” 2020. Does that mean you are using a cracked version?

Its it the selected object here that you are trying to position?