[Bacardi]

You can't create third sub-menu using SM admin menu custom.
You need ask custom plugin for this.

PHP Code:

"Commands"
{
    "Maps"
    {
        "Aim"
        {
            "cmd"        "sm_map #1"
            "1"
            {
                "type"        "mapcycle"
                "path"        "cfg/cfg/aimmaps.txt"
            }
        }    
        "AWP"
        {
            "cmd"        "sm_map #1"
            "1"
            {
                "type"        "mapcycle"
                "path"        "cfg/cfg/AWPmaps.txt"
            }
        }    
        "Knife"
        {
            "cmd"        "sm_map #1"
            "1"
            {
                "type"        "mapcycle"
                "path"        "cfg/cfg/Knifemaps.txt"
            }
        }    
    }
}