Point cloud feature extraction intersecting planes

I have been experimenting with the plane creation tool in feature extraction app available from the app exchange and it appears to be a really usefull tool however being new to AutoCAD I can not find a way to intersect the planes. I would like to do this in order to allow me to create corners of buildings that may have been missed due to the scan density. Is there any way to intersect these planes? Any help would be greatly appreciated.

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Image may be NSFW.
Clik here to view.