TWID (Traveling With ID) is to indicate who is traveling together. You can use this to indicate who is traveling with each other within a group trip.
Ex. When you select a TWID number, it will move that traveler down to the TWID number. The system auto sorts the traveler once you select the TWID number. So if you select TWID # 15, it will move that traveler down to 15 and give it the TWID # 15.
