I am making a table that will have mortise and tennon joints connecting the rails to the legs. I drew a rectangle 1" x 4" and used the fillet tool so I won't have to cut a tennon with rounded corners. This leaves an amount of material that I would have to remove. I drew a small rectangle in the area I need to remove, (the small green box at the right end of the top rectangle). Next I used the weld tool to create a more suitable end. The lower drawing shows the tennon in red and how it will fit into the mortise on the right end as compared to the left end. I will have a very small corner to remove with a file or coarse sandpaper.