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https://developer.wordpress.org/themes/basics/template-hierarchy/

https://codex.wordpress.org/Navigation_Menus

functions.php-be:
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function register_my_menu() {
  register_nav_menu('new-menu',__( 'New Menu' ));
}
add_action( 'init', 'register_my_menu' );

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ahol a menut akarom, h megjelenjen:
 <?php wp_nav_menu( array( 'theme_location' => 'new-menu', 'container_class' => 'new_menu_class' ) ); ?>