Try creating a curtain wall with no panels.
You can use Solid Element Operations to subtract it from the wall and then hide the curtain wall in a layer you can turn off.
Any amendments required will just need a edit of the curtain wall.
your curtain wall can follow a set scheme or you can modify the position of the individual frames to suit the elevation.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
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