wizzud

This plugin enables a Custom Menu to “include” any other Custom Menu, so groups of items that get repeated across multiple menus can be defined just once and then included into any other menu at will.
If you have a set of menu items that you repeat across several menus, it can be a bit of a pain when 
one of that set needs updating and you have to go through all your menus changing each one.
This plugin allows you to define the subset of items as a separate menu, and then include that menu 
into any other menu. If you then need to maintain one of the items in the subset, you only need to update 
one menu, and the change automatically gets reflected in all the other menus that include that subset!
It’s as easy to use as adding a Post, Page, Category or Tag to your menu…
With the plugin activated, go to your Menus page in admin. 
As well as being able to add Posts, Categories, etc, to your menu, you should now see a metabox for 
Navigation Menus which has checkboxes for each of your defined Menus (if you don’t see the metabox, 
check your Screen Options settings at the top of the page). 
All you need to do is create your submenu (as you would any other menu), 
open the menu you want to insert the new submenu into, 
select the submenu from the Navigation Menus metabox, 
Add it, 
and position it. 
Save and you’re done!
The inserted Menu replaces the Navigation Menu item in the menu. You can insert multiple instances of the 
same submenu into one menu, and you can include a submenu into as many other menus as you need.
<h4>Perpetual Loops</h4>
The one thing that the plugin guards against is getting into a never-ending loop : it won’t prevent you 
setting one up (see FAQs as to why), but it will not output any submenu that has itself as an antecedent.
For example, you can set up menus such that Menu A includes Menu B, which includes Menu C. Fine, no problem. 
However, if you were to also add Menu B into Menu C as a Navigation Menu item, 
then no matter which menu you choose to output, you have a potential loop 
(… B, includes C, includes B, includes C, … and so on).
If WP_DEBUG is enabled, the plugin will print a warning wherever it has taken action to prevent a loop condition. 
This behaviour can be changed by hooking into a filter (see FAQs).
<h4>Frontend Only</h4>
The plugin only performs the menu replacement at the frontend of WordPress (ie. not on Admin pages). 
This behaviour can be changed by hooking into a filter (see FAQs), 
but please ensure that you do not enable it for the Menus admin page!

Menu In Menu

This is so useful and I was surprised that this didn't already exist in core. Thanks for building it!

Awesome! Should be in core WordPress

Place one Custom Menu inside another Custom Menu

Janis Elsts

Admin Menu Editor lets you manually edit the Dashboard menu. You can reorder the menus, show/hide specific items, change permissions, and more.
Features
<ul>
<li>Change menu titles, URLs, icons, CSS classes and so on.</li>
<li>Organize menu items via drag & drop.</li>
<li>Change menu permissions by setting the required capability or role.</li>
<li>Move a menu item to a different submenu. </li>
<li>Create custom menus that point to any part of the Dashboard or an external URL.</li>
<li>Hide/show any menu or menu item. A hidden menu is invisible to all users, including administrators.</li>
</ul>
The <a href="http://w-shadow.com/AdminMenuEditor/" rel="nofollow ugc">Pro version</a> lets you set per-role menu permissions, hide a menu from everyone except a specific user, export your admin menu, drag items between menu levels, make menus open in a new window and more. <a href="http://amedemo.com/wpdemo/demo.php" rel="nofollow ugc">Try online demo</a>.
Additional Features
Despite the name, this plugin is not limited to just editing the admin menu. You can also:
<ul>
<li>Create login redirects and logout redirects.</li>
<li>Allow/deny access to specific posts based on user roles.</li>
<li>Hide plugins on the Plugins -> Installed Plugins page from other users.</li>
<li>Edit the display name, description, and other plugin details shown on the Plugins -> Installed Plugins page (e.g. for white-labelling).</li>
</ul>
Shortcodes
The plugin provides a few utility shortcodes. These are mainly intended to help with creating login/logout redirects, but you can also use them in posts and pages.
<ul>
<li><code>[ame-wp-admin]</code> – URL of the WordPress dashboard (with a trailing slash).</li>
<li><code>[ame-home-url]</code> – Site URL. Usually, this is the same as the URL in the “Site Address” field in Settings -> General.</li>
<li><code>[ame-user-info field="..."]</code> – Information about the logged-in user. Parameters:
<ul>
<li><code>field</code> – The part of user profile to display. Supported fields include: <code>ID</code>, <code>user_login</code>, <code>display_name</code>, <code>locale</code>, <code>user_nicename</code>, <code>user_url</code>, and so on.</li>
<li><code>placeholder</code> – Optional. Text that will be shown if the visitor is not logged in.</li>
<li><code>encoding</code> – Optional. How to encode or escape the output. This is useful if you want to use the shortcode in your own HTML or JS code. Supported values: <code>auto</code> (default), <code>html</code>, <code>attr</code>, <code>js</code>, <code>none</code>.</li>
</ul>
</li>
</ul>
Notes
<ul>
<li>If you delete any of the default menus they will reappear after saving. This is by design. To get rid of a menu for good, either hide it or change it’s access permissions.</li>
<li>In the free version, it’s not possible to give a role access to a menu item that it couldn’t see before. You can only restrict menu access further.</li>
<li>In case of emergency, you can reset the menu configuration back to the default by going to http://example.com/wp-admin/?reset_admin_menu=1 (replace example.com with your site URL). You must be logged in as an Administrator to do this.</li>
</ul>

Admin Menu Editor

Does just what it says it does. Instantly.

Perfect

I've been a user of Admin Menu Editor and the Pro version for a while now. WordPress backend can get a little messy very easily, so this plugin comes to the rescue, and it does it well.

I wish all the features were free, but the devs need to pay the bills as well :-)

Best option


It allows you to move existing items on the left side menu around and change their icons.


Not Bad, simple to use


Essential for taming the admin menu, due to all the stupid ideas other developers have for their menus!


Essential

Lets you edit the WordPress admin menu. You can re-order, hide or rename menus, add custom menus and more.

Menu In Menu vs Admin Menu Editor