Do you know, that… ?

The situation is quite common, but, according to my observations, it is somewhat problematic… Application is not working group nor can it be meaningfully done with Trim / Extend.

So how to do it?

One beam should be drawn.

Then select Trim / Extend and use as plane clipping tools (if the beam is centered in the 3D system). note, that should be rejected 3 objects, a 1 keep.

Then we reflect the cut beam twice with a mirror in relation to the same planes (like object) and ready.

Do you know a better method?

Share your solution in the comments.