It’s very simple right now: it will split all selected structural columns at a level elevation specified by the user (beta developed by Ken Marsh)
Read previous related post (including dialog on bugs related to slanted columns and masking):
Well, there are at least three:
1) Wall by Face tool, from a slanted Mass face
2) My Wall Component family, with adjustable angle and corner voids – download here
(warning – unsupported workflow)
3) This Thick Wall with Reveal method
We were given the ‘Slanted Column’ ability when some of the Structural tools were recently incorporated into Revit Architecture. If you have been pulling your hair out trying to place one of these slanted columns in a Plan view (where the tool is greyed out), the answer is simple. Go to a Section, Elevation or 3D View to place them!
You will likely need to set an appropriate workplane to ‘draw’ these slanted columns on.
The Brace tool is also quite cool – have a go at the ‘3D snapping’ capability in the Options bar (try it in a 3D view, obviously).
If you are interested in reading further, check out: