Originally Posted by
sambagrrl07
She said she tried to price it both with an individual segment and for the itinerary as a whole, but I'll follow your suggestion, thanks!
Even if a premium cabin was sold out on one of the segments, that shouldn't prevent you a sellup on the journey as whole (you wouldn't get the sold out one of course).
One scenario where it can get dicey is dealing with an expensive fare class such as J on one or more segments and re-pricing can make it astronomically expensive.