You can add your airline account, TSA, and/or Global Entry number to your flight itinerary at airport check-in on the day of departure for commercial flights. These numbers cannot be added ahead of time as GradCity flights are booked on group space.
Alternatively for your airline account, if you keep your individual boarding passes/ticket numbers, you can submit them to the airline after travel to receive credit for those flights.
For charter flights, TSA and/or Global Entry number may not be eligible to add to booking.