Use the Stretch option to stretch wireframe objects:
For each object type, the points used to stretch the object are given below.
In the graphics window, you will see the stretch origin marker . It is placed at the centre of the selection of objects. The stretch points are also marked .
The stretch origin is used to stretch the objects. When you input the position to stretch the objects, the stretch origin is moved to the new position and the stretch points are moved such that they are placed relative to the stretch origin.
If a whole object is selected, it is highlighted in the selection colour and is moved rather than stretched.
If you enter a position, the stretch origin moves and the stretch points move relative to it.
In this example, the stretch origin is moved by dragging the top stretch point.