How to register custom menus in wordpress?

You can register multiple custom menus in wordpress for your theme. These menus can be shown on different locations. There is a wordpress function that you can use for this purpose that is following.

   <?php register_nav_menus( $locations ); ?>

You can use it for multiple locations as following.
Add following code in your theme’s functions.phpfile.

<?php   
  if ( ! function_exists( 'register_my_menus' ) ) : ////// check function already exist…….
    function register_my_menus() {
     register_nav_menus(
           array( 'custom-menu1' =>  'Custom Menu1', 'custom-menu2' =>  'Custom Menu2')
         );
 }
 add_action( 'init', 'register_my_menus' );
?>      

Now add these locations in your theme templates as following.

<?php wp_nav_menu(array( 'theme_location' => 'custom-menu1','container'=>'','menu_class'=>'','menu_id'=>'custom-menu1' )); ?>      

Same as for other menu. That’s it.