How to Hide the "Convert SEO Data" Admin Menu

function plt_hide_seo_data_transporter_menus() {
	//Hide the "Tools → Convert SEO Data" menu.
	remove_submenu_page('tools.php', 'seodt');
}

add_action('admin_menu', 'plt_hide_seo_data_transporter_menus', 11);

Where do I put this code?