You can insert doors and windows on Polygonal walls in version 10 and 11. Which version you are using? Add your ArchiCAD version, Build Number & OS to your signature.
ArchiCAD Services
ArchiCAD since v9 to latest
iMac, Windows 10
now i m presently using ArchiCAD12..
my general question was this, why there isn't option in ArchiCAD 9 for not inserting doors and windows on polygonal wall. i dint check with ArchiCAD 12.
Anyhow i got the answer through reference......
The straight and trapezoid walls could cover you wherever doors or windows could possibly go and just use the poly-walls for the troublesome intersections and transitions where doors and windows don't fit.