Use the Trim Feature Lines command to trim selected feature lines manually.
This command works similarly to the
Autodesk Civil 3D command TrimFeatures.
In the Toolspace, on the Toolbox tab, expand Miscellaneous Utilities SHP Import/Export Utilities Geometry and Breakline Tools. Double-click Trim Feature Lines.
Select the objects to serve as cutting edges.
Select the feature line(s) or other linework to trim.