Question about adding new application categories in gOS Rocket E

[Darth Chaos]

I'm trying to customize my copy of gOS Rocket E to somewhat resemble
gOS Space in that I'm adding most of the web apps that came with gOS
Space. I accomplished the adding of web apps by creating .desktop
files in /usr/share/applications. For example, I created
myspace.desktop and pasted in the following:

[Desktop Entry]
Encoding=UTF-8
Name=MySpace
Comment=MySpace
Exec=firefox http://www.myspace.com
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=myspace.png
Categories=Application;Network;MySpace;

NOTE: I copied the extra icons over to /usr/share/icons/gOS/scalable/
apps.

Anyway, I was wondering if it were possible to create brand new
application categories so I can place some of the web apps in the new
categories. For example, I'd like to create a Google category and
place all my Google Apps in that application category (ex. Start ->
Applications -> Google -> Gmail). I also want to add a News category
so I can add my customized web apps (BBC, CNN, Fox News, Daily Kos,
Huffington Post, Infowars, NY Times, etc.) to that category (ex. Start
-> Applications -> News -> CNN).