I have a model of a property line block wall that is on a slight arc. When I try to fill in the open area between the wall and the back of sidewalk by drawing lines and arcs to make the interior shape, I don't get a face because it is non planer. The lines are sticking to the existing lines which causes the problem. Sometimes I can use soften edges to make a surface, but with the arc in the shape I can't create triangles over the whole shape. The only way I found if to group the entire area then draw my shape and paint that. Then I group that shape, edit the group and move the corners to the final shape. Is there an easier way to make a face with non-planer edges?