How can I close the top part of this wall?

Hi, I’ve substracted the inclined roof from this wall and it didn’t come out as a solid. PlanarSrf doesn’t work because it’s not a flat curve. What is the most straight-forward method to build the cap?
Thank you very much

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it looks like the top part has been trimmed off by one curve or some element which follows a curve, if you share the model somebody can show you how that would be done by extruding that curve and trim the rest off.

or you could just extrude that curve marked orange and trim off the rest

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The most straight forward approach depends on the shape of the top edges, which presumably depends on the shape of the roof. Upload a .3dm file with the geometry and include the roof if possible.

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