Find Elements Associated with a Particular Level
Have you ever had to pick up someone else’s project and try to figure out how it all goes together? Or maybe you were trying to delete a level, and Revit just went ahead and deleted all associated elements without telling you?
I found a great tool on the AUGI Forums that actually reports all the elements on a particular level! You can download it at http://forums.augi.com/showpost.php?p=864748&postcount=22 (you need to login to the forums obviously).
To help you install it, check out http://forums.augi.com/showpost.php?p=921396&postcount=36.
I have installed and used it with 2010 and it seems to work fine. Thanks to sfaust!
Discussion
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"copy the .dll file into wherever you want to keep external commands (I use "C:Program FilesRevit Architecture 2009Addons"). Then you will need to modify the .ini file for your Revit install which can be found at "C:Program FilesRevit Architecture 2009ProgramRevit.ini" if you installed in the normal location.
Double click it and it will open in notepad. Scroll down to find the section that starts with "[ExternalCommands]". The next line should say "ECCount=" and some number, add 1 to that number.
The next lines will be the definitions of your external commands, which will follow this format:
ECName#=
ECClassName#=
ECAssembly#=
ECDescription#=
where the # represents whichever command it is. Also, ECDescription is optional, so some may not have that.
Go to the last definition that follows this format. Copy the 4 lines from the .ini file I posted earlier that follow this format to the clipboard. Paste these lines after the last command definition.
Change the numbers on what you just pasted to the number after the last definition (i.e. if you had 3 commands defined already, you change the pasted ones to ECName4, ECClassName4, etc.). Lastly, change the path under ECAssembly to wherever you copied the .dll file initially.
Then the next time you start Revit you should be good to go..."
From http://forums.augi.com/showpost.php?p=921396&postcount=36