Changing award tickets online
I have booked some tickets to Asia later this year. My current reservations go into and out of BKK. I would now like to terminate my outbound travel at another destination (transiting through BKK but with no stopover there), which essentially means I just need to add a flight to my current outbound reservation.
On the return, I now want to leave BKK a few days earlier so I can stop in NRT for a few days. So, I merely need to move my BKK-NRT segment up by a few days.
I noticed that UAL.com has functionality to change award reservations. Assuming that there is availability, is adding a leg on the current outbound flight and moving the BKK-NRT segment on the return flight up by a few days something that I can do online easily without risking screwing up my existing ticketed reservation? Or, will initiating a change online essentially wipe out my current reservation and put me at risk for losing my current partner award availability while UAL re-tickets?
Any insights appreciated.
Thanks.