In 1.CAD, the objects commonly used for stretching are straight lines, circular arcs, elliptical arcs, polylines, spline curves and so on. The length of a stretched object can be changed by stretching.

2. By opening the CAD software, find the modification and click Elongation, you can use the Elongation command.

3. When the selected stretched graphic object is completely in the selection box, the result of stretching can only be the translation of the graphic object relative to the original position.