जिंदगी में शादी के अलावा ट्रेन में RAC ही एक ऐसी स्थिति है,जिसमें दो अजनबी साथ निभाने को मजबूर होते है। - Junaid

There are two different things, while booking online, you can choose a boarding point which is different from the station from which you are booking. That facility is available online.
But once you have booked a ticket, change in baording point is not possible online. You have to go to reservation counter and do that.

---