How to Hide WebHotelier for WordPress Admin Menus

function plt_hide_webhotelier_menus() {
	//Hide "Tools → Codestar Framework".
	remove_submenu_page('tools.php', 'csf-welcome');

	//Hide "WebHotelier Options".
	remove_menu_page('wp-webhotelier_options');
	//Hide "WebHotelier Options → Form Fields Settings".
	remove_submenu_page('wp-webhotelier_options', 'wp-webhotelier_options#tab=form-fields-settings');
	//Hide "WebHotelier Options → Form Customization Settings".
	remove_submenu_page('wp-webhotelier_options', 'wp-webhotelier_options#tab=form-customization-settings');
}

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

Where do I put this code?