Select the Curtain Wall. Click the Edit in 3D text that appears in the middle of the Curtain Wall.
In the Toolbox, select the Accessories Tool.
You can either click a intersection point of Frames, then another one, then provide the orientation.
Or you can click a Frame, give the length of the Accessory and provide the orientation with successive click.
When you start creating it, check what the shadow line shows: it shows where the element will be created based on your input.
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