Autodesk Revit Architecture

[#1]

It appears there is no way to delete or purge unused grid family types, even in 2012. Is this true, or am I missing something?

[#2 · Accepted solution]

After some testing, I can purge unused grid types. Here is a video of my testing:

http://screencast.com/t/TafXJbU9MRZV

Please let me know what I am doing differently.

[#3]

Thanks Chris. Silly me, I was looking for Grids under Other Styles, since Grids is a system family.