You can cut segment into two new segments. Add a new segment from nowhere to the point of the segment you want to cut. A new junction will be added. Delete the new segment just created. The junction which was automatically added will remain.
You can cut segment into two new segments. Add a new segment from nowhere to the point of the segment you want to cut. A new junction will be added. Delete the new segment just created. The junction which was automatically added will remain.