This is part of the Symfony Cmf: http://cmf.symfony.com/

http://symfony.com/doc/master/cmf/bundles/menu.html

The general installation documentation for the CMF can be found here: http://symfony.com/doc/master/cmf/tutorials/installing-configuring-cmf.html

These instructions should help you if you want to use this bundle alone.

The bundle is best included using Composer.

Edit your project composer file to add a new require for symfony-cmf/menu-bundle.

Add this bundle (and its dependencies, if they are not already there) to your application's kernel:

// application/ApplicationKernel.php
public function registerBundles()
{
    return array(
        // ...
        new Doctrine\Bundle\PHPCRBundle\DoctrinePHPCRBundle(),
        new Knp\Bundle\MenuBundle\KnpMenuBundle(),
        new Symfony\Cmf\Bundle\MenuBundle\SymfonyCmfMenuBundle(),
        // ...
    );
}