GGU-DRAWDOWN: "Define via editor" menu item
When editing an excavation bounded by a polygon, you can enter x and y coordinates for the polygon course here.

Please remember that the polygon course must be oriented anti-clockwise. With the "x points to edit" button you can redefine the number of points. If more than eight points are present you can move through the table with the "Forw." and "Back" buttons. You can save a polygon course in a file with the ".bgp" or open one previously saved.