I found in this topic a code which creates a menu and sub menu but I did not found how to create titles inside menus. something like this:

import c4d
from c4d import gui

def EnhanceMainMenu():
    mainMenu = gui.GetMenuResource("M_EDITOR")                 
    pluginsMenu = gui.SearchPluginMenuResource()               


    menu = c4d.BaseContainer()                                 
    menu.InsData(c4d.MENURESOURCE_SUBTITLE, "My Menu 1")  
    menu.InsData(c4d.MENURESOURCE_COMMAND, "PLUGIN_CMD_{}".format(c4d.Ocube))      
    menu.InsData(c4d.MENURESOURCE_SEPERATOR, True);             
    menu.InsData(c4d.MENURESOURCE_COMMAND, "PLUGIN_CMD_{}".format(c4d.Osphere))     
    menu.InsData(c4d.MENURESOURCE_COMMAND, "PLUGIN_CMD_{}".format(c4d.Oplane))     

    submenu = c4d.BaseContainer()
    submenu.InsData(c4d.MENURESOURCE_SUBTITLE, "Menu 2 ")
    submenu.InsData(c4d.MENURESOURCE_COMMAND, "PLUGIN_CMD_{}".format(c4d.Onull))     
    menu.InsData(c4d.MENURESOURCE_SUBMENU, submenu)

    if pluginsMenu: mainMenu.InsDataAfter(c4d.MENURESOURCE_STRING, menu, pluginsMenu)
    else: mainMenu.InsData(c4d.MENURESOURCE_STRING, menu)

def PluginMessage(id, data):
    if id==c4d.C4DPL_BUILDMENU:
        EnhanceMainMenu()