In 3D you can edit the Curtain Wall and you can set the primary and secondary grid of the Curtain Wall to be at an angle other than 90 degrees.
Similarly you can move the whole grid to position it to the exact desired location.
Notice that in the little palette in the upper left corner of the 3D Window I switched on Scheme and turned off Frame and Panel to be able to easier manipulate the Scheme of the Curtain Wall.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
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2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28