The Trim tool  on the Advanced Editing toolbar lets you click a line feature and trim it based on its intersection with a selected line feature. To use the Trim tool, select the feature that you want to use as a cutting line, then start clicking the intersecting line segments that you want to trim. The part of the line that you click will be removed.
 on the Advanced Editing toolbar lets you click a line feature and trim it based on its intersection with a selected line feature. To use the Trim tool, select the feature that you want to use as a cutting line, then start clicking the intersecting line segments that you want to trim. The part of the line that you click will be removed.



- Click the Edit tool  on the Editor toolbar. on the Editor toolbar.
- Select the line segment at which you want to trim a line.
- Click the Trim tool  on the Advanced Editing toolbar. on the Advanced Editing toolbar.
- Click the end of the feature that you want to trim. 
The line you clicked is trimmed to the selected line.