This technique is File merged based.

This script also builds the wall with cutouts and places a rose window into the round cutout. This is the script you would use as your final script.

1. Copy the script in the column below.
! all
! Hide
! merge
c:\tutorialscripts\plans\Oecusfacade.3dm
! Selcurve
! Extrude
Cap=Yes
-0.4
delete
! enter
! merge
c:\tutorialscripts\elements\rosewindow.3dm
Lastcreated
move
w0,0,0
w-13.519,-0.00041,3.46361
selnone
show

2. Make sure perspective viewport is active.
3. Run the script by clicking the commandpaste icon.
The script created a wall with window and door cutouts and placed a Rose window grille in the round cutout.

4. Quick Render the model
5. Select all and delete. Exit the drawing when prompted to save enter no.