Release 2011: The Families Guide was not updated for Revit 2011. Please use the 2010 edition of the Families Guide.
Autodesk – Autodesk Revit Architecture Services & Support – Families Guide
Do you get the feeling that perhaps, if Autodesk put it off long enough, they won’t have to update some of this documentation?
With the official Wiki now in operation, and a plethora of blogs, where will Autodesk draw the line with regards to Help documentation?
Were you aware that Revit has an official WikiHelp page? You can login using your Autodesk Consolidated ID, and then collaborate and share your wisdom with the world.
There are also videos available for viewing on this site.
2011 – WikiHelp
There are specific areas for:
link fixed 3/3/11
You want to know which families are cuttable and which are not. Revit 2011 help gives the answer:
Cuttable families (link):
Curtain Wall Panels
Non-cuttable families (link):
What is a cuttable family?
If a family is cuttable, the family displays as cut when the cut plane of a view intersects that family in all types of views. From Revit 2011 help.