Tips on Customizing Booking Package

How to Hide Booking Package Admin Menus

function plt_hide_booking_package_menus() {
	//Hide "Booking Package".
	remove_menu_page('booking-package/index.php');
	//Hide "Booking Package → Booked Customers".
	remove_submenu_page('booking-package/index.php', 'booking-package/index.php');
	//Hide "Booking Package → Users".
	remove_submenu_page('booking-package/index.php', 'booking-package_members_page');
	//Hide "Booking Package → Calendar Accounts".
	remove_submenu_page('booking-package/index.php', 'booking-package_schedule_page');
	//Hide "Booking Package → General Settings".
	remove_submenu_page('booking-package/index.php', 'booking-package_setting_page');
}

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

Where do I put this code?

How to Hide the "Booking Package" Dashboard Widget

function plt_hide_booking_package_dashboard_widgets() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Remove the "Booking Package" widget.
	remove_meta_box('booking-package', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_booking_package_dashboard_widgets', 20);