Originally Posted by
Tango
Sabre allows you to enter different FF numbers by segment-- the only problem is most people do not know the format and do not want to take the time to look it up.
http://www.flyertalk.com/forum/showthread.php?t=624442
Discusses this exact same issue about crediting FF by segment.
The important thing is to make sure that all FF numbers get cleared out before trying to enter by segment. Otherwise the overall FF number will usually trump the segment FF numbers.