In this tutorial, you can learn How to create Ladder members on the pillars on 3D model of the roller coaster - El Toro Six Flags
out of curiosity, is there a reason you are not using the fill-pattern and thus removing the need for relations?
Hi, thanks for your question.
My idea was that I will place this assembly by COPY and PASTE function and I will drive the length by Flexibility:
How to place UDF Ladder members - El Toro Six Flags | Part4 - https://youtu.be/BaoDy_eEwP0