I am writing Contextual Menu Plugins for Leopard OS and referring Writing Contextual Menu Plugins for OS X, part 1 article by Brent Simmons. My plugin is working fine.

Is there any way to move my test menu into main menu (above the Label)?
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The short answer is “no”.
The OS controls what gets displayed in that menu, so in order to change it around, you would need to call private methods, reimplement system-level functionality, and just in general do some Very Bad Things which would be unsafe, could break at a moment’s notice, and possibly work differently between even dot releases of the same OS.