How do I transform extra bones between a joint if arm is turned 90 degrees forward and backwards, same with left and right in ctrl rig. I just need a tutorial on one bone please?

Any One? I have searched for 2 years, I have tried myself. I cant figure it out. I went through 2 opperations that caused brain damage and still I tried. I still cant figure it out.

I wish someone could create a node for this for start and end position for x 90 or -90 y 90 or - 90 and so on. Im still trying. Its hard changing all 300 animation assets to do the same thing.

Or I am going to try pose assets.

I also Created a pickup system where I can pickup items from different heights and also jumping to to reach an item I dont know how to import this tutorial on this site?