Stretching with the Marquee Tool

Alternatively, choose the Edit > Reshape > Stretch command, and then define the stretch vector by clicking any two different points.
Note: If you don’t want to stretch an element whose node is inside the Marquee, lock the element (select it, then use Edit > Locking > Lock; or lock the element’s layer.).
Columns, Objects and Lamps cannot be stretched with the Marquee. If any of their hotspots fall inside the Marquee area, the whole object/column will be dragged along when the Marquee area is repositioned.
When stretching Arcs or curved Walls with the Marquee, their central angle (i.e. the arc/chord ratio) will remain unchanged.