To Stretch Pipe, Cable Tray or HVAC Duct

Select Extend from the Modeler Tools section of the Piping ribbon..

Select the segment using one of the Element Selection methods.

Snap to the open port of the segment that is to be stretched.

Use the mouse to drag the pipe/tray to the desired length and left-click to complete the process.

By default, the command will remain active until you select another command.