Usually, solids are pulled from the surface, so just stretch them directly. Stretch->; Select surface->; Just set the parameters. The surface generated by the arc you mentioned has no problem in stretching. The stretching direction is the normal direction of the surface. However, some surfaces cannot be stretched directly. You should first extract the contour line, then project it on a plane, stretch the contour curve, and then cut the extended entity with the cambered surface to get the entity you need.