The Line option allows you to add a line between any two points on a view. To add a Line:
Select Line from the toolbar or the Add Tool sub-menu of the Tools menu.
Enter the first point graphically with the mouse, or enter x,y coordinates in the prompt line. NOTE: the Snap options are available in the right-click menu, if you want to snap exactly to certain coordinates.
As you move the mouse, a line will connect the first point to the current cursor location.
Enter the second point graphically with the mouse, or enter x,y coordinates in the prompt line, and the Line will be added to the view.
After a Line has been added, it can be moved, re-sized, formatted, etc. See the Edit Tools Overview topic for details.