Wp add menu page and subpage

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$menu_slug = 'wpdocs-orders-slug';
add_menu_page( 'WP Docs Orders', 'WP Docs Orders', 'read', $menu_slug, false );
add_submenu_page( $menu_slug, 'Existing WP Docs Orders', 'Existing WP Docs Orders', 'read', $menu_slug, 'wpdocs_orders_function' );

Source: developer.wordpress.org

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