Trim Lines to a Reference Line

Trim all selected line elements to a single reference line.

Select Drafting | Line Tools | Trim Lines to a Reference Line.
First select the line to which the lines are trimmed.
Select the end of the line to be trimmed. When necessary, the selected line continues to the target line, or the line section is deleted.
Select Confirm.

Note:

You can also trim a line with the geometric constraint, Identical.