The menu editor is the place to do this. Mate's version just isn't quite as flexible as Cinnamon's - particularly with moving items between categories.
You might also want to look at alternative menu applet with a less cluttered layout than the default menu applet - there are several available in Mate to add to the panel. They all use the same backend configuration for where menu items are categorised.
Anyway -
New Menu to create a new category.
New Item to create an entry in a category.
Highlight any existing item click Properties to rename, change comment, icon etc.
In the Mate editor to move things between categories I think the only way to do it it to create an entry in the category of choice from scratch and delete or uncheck the original entry. I recommend unchecking rather than deleting The Cinnamon editor has a copy/paste function.
If you find the GUI menu editor clunky the other way would be to edit the background desktop files directly. Copy entries of choice from
/usr/share/applications to
~./local/share/applications - open in a text editor via right click. They look like this. Change the Name, Icon, Categories as required. You can add new desktop files to
~./local/share/applications as-well.
Code: Select all
[Desktop Entry]
Version=1.0
Type=Application
Name=GNU Image Manipulation Program
GenericName=Image Editor
Comment=Create images and edit photographs
Exec=gimp-2.8 %U
TryExec=gimp-2.8
Icon=gimp
Terminal=false
Categories=Graphics;2DGraphics;RasterGraphics;GTK;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=GIMP
X-GNOME-Bugzilla-Component=General
X-GNOME-Bugzilla-Version=2.8.22
X-GNOME-Bugzilla-OtherBinaries=gimp-2.8
StartupNotify=true
MimeType=image/bmp;image/g3fax;image/gif;image/x-fits;image/x-pcx;image/x-portable-anymap;image/x-portable-bitmap;image/x-portable-graymap;image/x-portable-pixmap;image/x-psd;image/x-sgi;image/x-tga;image/x-xbitmap;image/x-xwindowdump;image/x-xcf;image/x-compressed-xcf;image/x-gimp-gbr;image/x-gimp-pat;image/x-gimp-gih;image/tiff;image/jpeg;image/x-psp;application/postscript;image/png;image/x-icon;image/x-xpixmap;image/svg+xml;application/pdf;image/x-wmf;image/x-xcursor;
X-Ubuntu-Gettext-Domain=gimp20