take curve from flat intersection with solid

[volaff]

Bye.
I used the search function but found nothing about it.
I would have a curiosity.
Is there an automatic command (semi) to take the contour curve of a solid intersected by a plane quickly?
or do I have to do section by section and take the boundary curve with (for example) convert entities?

Thank you all.

 

[volaff]

to complete the solid under examination is in step format and I should make several sections at different odds.