Creates a 3D section by using a closed polyline, rectangle, or polygon to cut through the solid. The section is normal to the plane of the polyline.

Select Section by Closed Polyline from the local menu or Inspector Bar.
Select the object to section. You can use Shift to select more than one object, or use a selection window (first click outside the objects, then drag the window).
Select the closed polyline.
The 3D section is created.

You can view the 3D section more clearly by removing the original solid. (The render mode here is Hidden Line.)

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