How to derive a 2d intersection?

I’d like to be able to use a plane, object, or some operation to be able to derive a 2d intersection, but can’t seem to find a way to do this. In the example below, I’m trying to get the shape shown as the single polyline:

If I try using a plane to cut through the extruded perimeter, I get a solid surface…

FYI, sometimes it will be on an angle, so using the profile that was extruded into the “walls” won’t work.

What are some ways to do this?

Have you tried to Project a curve from frontview?
Or make a plane and intersect.

Yeah, thanks - just found out there is an “intersect” command… thanks!

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Additionally, there is _Section

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This is great. Thanks.

And there is Contour.—-Mark

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Lol! I’ll take a look. Sounds familiar but I don’t remember ever using it.

Hi,
And this is a bit more complex

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