As this is restricted area trekking, you need special permits. While processing to get those permits, we need to apply the trekking itinerary with the date how many days of trekking you would like to do, and where you like to visit. But when you are, enter a restricted area, and it will be flexible one or two days ahead or behind the itinerary. But you can’t overstay then your permit days nor can add trekking permits on the trek. You need to fix the trekking days and trekking area before processing the permits.