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//Add this code in your theme’s functions file to define a new menu location in your theme.
function wpb_custom_new_menu() {
register_nav_menu('my-custom-menu',__( 'My Custom Menu' ));
}
add_action( 'init', 'wpb_custom_new_menu' );
//Now you need to add this code to your theme where you want to display navigation menu.
<?php
wp_nav_menu( array(
'theme_location' => 'my-custom-menu',
'container_class' => 'custom-menu-class' ) );
?>
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