How to make an cut around a corner

Hi there,

I would like to know what is the best way to make a sort of cut loft around a corner. I tried a few times with 3d sketches and projected lines, but no succes.

The cut I want to draw is in the right bottum corner. It sweeps from the side to the front.

Does anybody know a quick way of doing this and maintain controll on the curvature?

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