Hi, I'm trying to make divots along the curve of this shape (so a curved hole all along that curve, to let things slot in and slide along), and my idea was to make a sketch plane offset from the face of the shape inside the body. Then, just draw a body along the profile of the curve, and extrude cut. I can't seem to get a sketch to be "inside" the body though - what am I doing wrong here? Maybe need