Originally Posted by vodkamike
1. This itinerary would require a xONE3 ticket, correct?...
If you want to include Australia it must be a xONE4.
2. Do you have to declare all the flights you wish to take, including internal flights in each continent?
Yes.
Edited to add: as for cancelling segments, check this thread:
http://www.flyertalk.com/forum/showthread.php?t=185677
starting at post #24