In every menu section there is a line <Name>. Make sure it is different for each menu section. There is also a line <Directory>. Change the name. The original is applications.directory. In a menu I created I changed to my.directory (for example). Then I copied the file /usr/share/applications/hildon/applications.directory to the file /usr/share/applications/hildon/my.directory. Then in this text file I changed the fields Name= and Icon=.