How to make a 3-level collapsing menu in Bootstrap?

Question

I am trying to make a 3-level collapsing navbar menu for Bootstrap, but I can\'t open the third level.

This is the two level menu which I have:

Answer 1

Bootstrap 3 dropped native support for nested collapsing menus, but there's a way to re-enable it with a 3rd party script. It's called SmartMenus. It means adding three new resources to your page, but it seamlessly supports Bootstrap 3.x with multiple levels of menus for nested

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• elements with class="dropdown-menu". It automatically displays the proper caret indicator as well.

  
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  Here's a demo page: http://vadikom.github.io/smartmenus/src/demo/bootstrap-navbar-fixed-top.html