How to Hide Einsatzverwaltung Admin Menus

function plt_hide_einsatzverwaltung_menus() {
	//Hide "Settings → Einsatzverwaltung".
	remove_submenu_page('options-general.php', 'einsatzvw-settings');

	//Hide "Incident Reports".
	remove_menu_page('edit.php?post_type=einsatz');
	//Hide "Incident Reports → All Incident Reports".
	remove_submenu_page('edit.php?post_type=einsatz', 'edit.php?post_type=einsatz');
	//Hide "Incident Reports → Add New Incident Report".
	remove_submenu_page('edit.php?post_type=einsatz', 'post-new.php?post_type=einsatz');
	//Hide "Incident Reports → Incident Categories".
	remove_submenu_page('edit.php?post_type=einsatz', 'edit-tags.php?taxonomy=einsatzart&post_type=einsatz');
	//Hide "Incident Reports → Fahrzeuge".
	remove_submenu_page('edit.php?post_type=einsatz', 'edit-tags.php?taxonomy=fahrzeug&post_type=einsatz');
	//Hide "Incident Reports → Externe Einsatzmittel".
	remove_submenu_page('edit.php?post_type=einsatz', 'edit-tags.php?taxonomy=exteinsatzmittel&post_type=einsatz');
	//Hide "Incident Reports → Alerting Methods".
	remove_submenu_page('edit.php?post_type=einsatz', 'edit-tags.php?taxonomy=alarmierungsart&post_type=einsatz');
	//Hide "Incident Reports → Units".
	remove_submenu_page('edit.php?post_type=einsatz', 'edit-tags.php?taxonomy=evw_unit&post_type=einsatz');

	//Hide "Tools → Einsatzberichte importieren".
	remove_submenu_page('tools.php', 'einsatzvw-tool-import');
	//Hide "Tools → Einsatzberichte exportieren".
	remove_submenu_page('tools.php', 'einsatzvw-tool-export');
}

add_action('admin_menu', 'plt_hide_einsatzverwaltung_menus', 1000);
Where do I put this code?