theode

I once thought I need different primary menus for different viewers. 
In best case those users have a GET paramter which decides which menu has to be shown.
For Example: 
You go into WordPress and add a menu with a name of your choice. I choosed “music”. 
Now if you want somebody view the music menu you have the parameter http://www.example.com/?view=music. 
You can do this with every menu you have.
In case you leave it empty nothing happen at all.

GET Different Menus

Have different primary menus for different viewers.

Ashar Irfan

A light-weight WordPress plugin to assign primary category to posts and custom post types.
<h3>How to Use</h3>
<ol>
<li>Browse to any post or custom post type in WordPress admin.</li>
<li>Check the taxonomies that you want to assign to it.</li>
<li>Select the respective primary taxonomies.</li>
<li>Save the post.</li>
<li>Use this shortcode to query the posts: <code>spc_primary_term_posts</code>.</li>
<li>Use the action hook — <code>spc_display_primary_term_posts</code> — to display the queried posts in your theme.</li>
</ol>

Simple Primary Category

A light-weight WordPress plugin to assign primary category to posts and custom post types.

GET Different Menus vs Simple Primary Category