Change the jgmenu content

How do I change the menu that pops up when i click the icon for jgmenu? I can change the top portion with the append.csv and the bottom with prepend.csv but I do not understand how to edit the middle portion. The jgmenurc doesn’t define the middle menu section

It gets the information from the /usr/share/applications/*.desktop files.

You would need to create a custom jgmenu to change any of that.