Hello ...
I am currently despairing over a step that I absolutely cannot manage:
I am drawing - in an isometric illustration - as part of a room view a round table with a round base plate, connected by a center column.
Both ellipses are finished, as is the center column. However, the stand would cover a rear part of the ellipse. That's why I'm trying to cut out the small piece of the ellipse of the base plate that is covered by the stand (see picture).
Translated with DeepL.com (free version)

It doesn't work.
I have tried with “Trim”, with “Divide” ... nothing works.
How can I implement this?