Here's a quick snippet on how to add custom menus to WP.
This piece of code goes into your theme’s functions.php file:
add_action('init', 'register_navmenus');
function register_navmenus() {
register_nav_menus(array(
'Header' => __( 'Header Navigation' ),
'Body' => __( 'Secondary Navigation' ),
'Footer' => __( 'Footer Navigation' ),
)
);
}Name the navigation items whatever suits your use case.