To combine two collinear curtain wall frames:
1. Click the Edit Curtain Wall tool from the Building Shell tool set, and click Combine Frame mode from the Tool bar.
2. Select the curtain wall to edit.
3. Click each of the two frames to be combined. Frames must be collinear.
At a four-way frame intersection, it may be necessary to split a perpendicular frame to be able to join collinear frames.
4. One frame is created. The attributes of the first clicked frame apply to both frames once they are combined.
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