Lofted cut out

I have a Problem, i want to create an extrusion with a cutout inside
For example on the top of the extrusion is a circle and on the bottom there is a contour.
Has anybody an idea how i can do this?

This part was imported from solid works.
I hope you understand what i want to.
Also i hope my English is ok to understand


Sven, two immediate methods come to mind. The Shell command might work. It should follow the different shapes from top to bottom. It might also shell other areas you don’t want, so the second approach might be to draw the shape you want on the top, and bottom, then loft between the two shapes. Once you have this new body, subtract it from the primary part.

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