a few ways 1. trace a boundary that goes around the window (long way) 2. Have as part of the window, a polyline that matches the perimeter, with knockout on. 3. Have a polyline that matches the window perimeter and make a void in the hatch.
Roger Donaldson AIA CSI CDT NCARB abUsing Datacad since 1986, ver 23.00.02.15 (SE) http://www.RogerDonaldsonArchitect.com