Ubuntu Studio 12.04: How to edit a custom Studio menu graphically after installing gnome?

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http://askubuntu.com – Here's the situation: I have installed Gnome and KDE alongside with default Studio Xfce in Ubuntu Studio 12.04. I want use the default Studio menu structure in Xfce, with some modifications (remove the things that i don't need in that environment). Actually i'm using the following "custom" menu in Xfce "/etc/xdg/xdg-ubuntustudio/menus/xfce-applications.menu" and the system default seems to be gmenu. When I open alacarte, it edits the default menu. What I precisely want: 1 - Edit the "/etc/xdg/xdg-ubuntustudio/menus/xfce-applications.menu", so that I'll only have what i need in it and only in (HowTos)