To delete one or more lines, select them and press Del or choose the Edit Delete command. The selected lines will be deleted.
You can move either end of a line to another symbol attachment point. To move a line end, select the line. Move the cursor to the end of the line that you want to move. When the cursor changes to the Pencil, click on the left mouse button and drag the line end to the new location. Then release the button, and the line will be redrawn to the new location.