Non linear cut lines with a thickness

I often need to cut parts for 3D printing. I also moved a week ago from Fusion to Shapr. In Fusion I would sketch a cut line, extrude the line into a 2D cut plane, then assign it a thickness of 0.1 - 0.2 mm to accommodate for the printer tolerances. What is the workflow in Shapr? I just did a dovetail cut and had to sketch a thin structure and then extrude it. Depending on the structure I want to cut, this is going to be complicated, specifically if I need to change the thickness of the cut structure.

So the questions are

Where is the option to extrude a line into a plane?
Is there a option to assign a thickness to a line or a plane?

Thanks much