Draft it Help
Now we will add the two windows. Use Zoom Window to close in on the top right hand quarter of the room.
Select the Line button and go Relative to P1. Now using Direct Input type -600' and press (this is the X value), now type '0' and (this is the Y value). Move up and snap to the 'Perpendicular' point on the line directly above at P3.
Now select the Offset button . Click on the line just drawn, drag to the left and type '1250' and press , as the Offset command needs only one value the Direct Input feature of Draft it accepts this and completes the offset.
It might be a good idea to Zoom closer in around the two new lines.
Now select the Offset button again. Click on the horizontal line just drawn, drag down and type '20'.
The window is complete and should appear as shown below.