I'm trying to make a cupboard, and I stumbled upon a problem (I'm a total beginner). I want to convert the edges shown in the picture to curves, bend them a little, and convert back to edge (in order to extrude the whole thing). I created the shown shape using the Knife tool. The reason is I'm trying to recreate a cupboard that has an negatively extruded design in a "smooth fashion" (see pic, kinda hard to explain). I'd really appreciate some help or a link to a youtube tutorial, I can't seem to find an answer to that.