how to create sub menu in sub menu?

[lavary]

how to create sub menu in sub menu?

[lavary]

You can call add() method on each item:

<?php
Menu::make('mainNav', function($menu) {
   $about = $menu->add('About', 'about');
   $level1 = $about->add('Level1', 'level-2-url');
      $level2 = $level1->add('Level2', 'level-2-url');
          $level3 = $level2->add('Level3', 'level-3-url'); 
});
?>

You can also chain add() methods and go as deep as you need:

<?php
Menu::make('mainNav', function($menu){
    $menu->add('About', 'about')
               ->add('level1', 'level-1-url')
                  ->add('level2', 'level-2-url')
                     ->add('level3', 'level-3-url');
});
?>

Hope this helps.