Use the Trim Away tool to delete any line portion bounded by an intersection with a line or edge.
The sketch grid must be visible in the workspace before you can trim lines.
To delete a bounded line
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Click
Trim Away in the Sketch group or press T. -
Mouse over a line to preview the section that will be deleted.
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Click to delete the highlighted line section.
The portion of the line you clicked is deleted up to any intersection with another 2D line or edge of a solid.