XFCE - how to edit menu ?

[jb]

Hi,
I find it annoying having same items listed in multiple menus, e.g.

- Accessories - Bulk Rename
                Orage Globaltime
                Terminal
                Thunar File Manager
                Help

- Office - Orage Globaltime

- System - Bulk Rename
           Terminal
           Thunar File Manager

- Applications Menu - Help

How can I edit the menus ?
Also, how to rename Applications Menu to e.g. just Menu as it would better
reflect applications and system (utilities) components ?

FB9-release, XFCE 4.8
jb