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

hakre

John Havlik

Breadcrumb NavXT, the successor to the popular WordPress plugin Breadcrumb Navigation XT, was written from the ground up to be better than its ancestor. This plugin generates locational breadcrumb trails for your WordPress powered blog or website. These breadcrumb trails are highly customizable to suit the needs of just about any website running WordPress. The Administrative interface makes setting options easy, while a direct class access is available for theme developers and more adventurous users.
<h4>PHP Requirements</h4>
Breadcrumb NavXT 7.0 and newer require PHP7.0 
Breadcrumb NavXT 5.2 and newer require PHP5.3 
Breadcrumb NavXT 5.1.1 and older require PHP5.2
<h4>Features (non-exhaustive)</h4>
<ul>
<li>RDFa format Schema.org BreadcrumbList compatible breadcrumb generation.</li>
<li>Extensive breadcrumb customization control via a settings page with appropriate default values for most use cases.</li>
<li>Network admin settings page for managing breadcrumb settings for all subsites with <a href="http://mtekk.us/archives/guides/controlling-breadcrumb-navxt-settings-from-the-network-settings-page/" title="Go to the article on configuring the network settings priority." rel="nofollow ugc">configurable global priority</a>.</li>
<li>Built in WordPress Widget.</li>
<li>Extensible via OOP and provided <a href="http://mtekk.us/code/breadcrumb-navxt/breadcrumb-navxt-doc/2/#action_reference" title="Go to the Breadcrumb NavXT Documentation's action reference." rel="nofollow ugc">actions</a> and <a href="http://mtekk.us/code/breadcrumb-navxt/breadcrumb-navxt-doc/2/#filter_reference" title="Go to the Breadcrumb NavXT Documentation's filter reference." rel="nofollow ugc">filters</a>.</li>
<li>WPML compatible (enhanced compatibility with WPML extensions plugin).</li>
<li>Polylang compatible (enhanced compatibility with Polylang extensions plugin).</li>
<li>bbPress compatible (enhanced compatibility with bbPress extensions plugin).</li>
<li>BuddyPress compatible (enhanced compatibility with BuddyPress extensions plugin).</li>
</ul>
<h4>Translations</h4>
Breadcrumb NavXT now supports WordPress.org language packs. Want to translate Breadcrumb NavXT? Visit <a href="https://translate.wordpress.org/projects/wp-plugins/breadcrumb-navxt/" rel="nofollow ugc">Breadcrumb NavXT’s WordPress.org translation project</a>.

Breadcrumb NavXT

This is a really powerful plugin! Would definitely recommend checking it out!

Powerful Plugin

Adds breadcrumb navigation showing the visitor's path to their current location.

Menu In Menu vs Breadcrumb NavXT