How to Hide Ditty Admin Menus

function plt_hide_ditty_news_ticker_menus() {
	//Hide "Ditty".
	remove_menu_page('edit.php?post_type=ditty');
	//Hide "Ditty → Ditty".
	remove_submenu_page('edit.php?post_type=ditty', 'edit.php?post_type=ditty');
	//Hide "Ditty → Add New".
	remove_submenu_page('edit.php?post_type=ditty', 'post-new.php?post_type=ditty');
	//Hide "Ditty → Layouts".
	remove_submenu_page('edit.php?post_type=ditty', 'edit.php?post_type=ditty_layout');
	//Hide "Ditty → Displays".
	remove_submenu_page('edit.php?post_type=ditty', 'edit.php?post_type=ditty_display');
	//Hide "Ditty → Extensions".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_extensions');
	//Hide "Ditty → Settings".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_settings');
	//Hide "Ditty → Import/Export".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_export');
	//Hide "Ditty → Display".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_display');
	//Hide "Ditty → New Display".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_display-new');
	//Hide "Ditty → Layout".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_layout');
	//Hide "Ditty → New Layout".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty_layout-new');
	//Hide "Ditty → Ditty".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty');
	//Hide "Ditty → New Ditty".
	remove_submenu_page('edit.php?post_type=ditty', 'ditty-new');
}

add_action('admin_menu', 'plt_hide_ditty_news_ticker_menus', 100);
Where do I put this code?