Topher

This plugin provides a metabox on posts and pages listing existing WordPress Menus. The end user is allowed to choose one and make it associated with the post or page via meta data.
Practically speaking, Featured Menus work exactly like Featured Images. The Post or Page and Featured Menu are merely attached, and you must use a template tag or WordPress functions to render the Menu.
Please see <a href="https://wordpress.org/plugins/wp-featured-menus/other_notes/" rel="ugc">Other Notes</a> for examples.
<h3>Usage</h3>
Page or Post meta has a key called <code>_wp_featured_menu</code>. A very simple way to render the menu is like this:
<pre><code><?php
 $meta = get_post_custom();
 wp_nav_menu( array( 'menu' => $meta['_wp_featured_menu'][0] ) );
?>
</code></pre>
A better way might be to test for the value first:
<pre><code><?php
 $meta = get_post_custom();
 if ( is_numeric( $meta['_wp_featured_menu'][0] ) ) {
 wp_nav_menu( array( 'menu' => $meta['_wp_featured_menu'][0] ) );
 }
?>
</code></pre>

WP Featured Menus

Provides a metabox on posts and pages listing existing WordPress Menus.

Human Made

Joe Hoyle

WordPress Menu Exporter lets you only export your WordPress Menus (like you can with Posts, Pages etc). The WordPress Menu Exporter plugin will also export and pages / terms that are referenced in yoru WordPress Menu.

WordPress Menu Exporter

Still works! Make export for nav items and creates a file that imports both nav and pages.

Love this plugin

A plugin taht lets you export only your WordPress menus via the WordPress Export page.

WP Featured Menus vs WordPress Menu Exporter