This is a very commonly used tool that is also very easy to understand and use. This tool is used to trim or extend selected lines or polylines to a selected location. Like most trim tools you can select more than one line to trim or extend at one time.
To use this tool:
1. Click on the tool (shown above).
2. Click on the line(s) which are to be extended and right-click to end the selection process. Be sure to select the end of the line to be trimmed or extended.
3. Move the mouse to the desired new location and click (the line can be made both longer and shorter).
