Yes , I meant one at the time . You can export only the parts that you've morphed ( and the bodyparts that "touch" them ) .For ex. if you made a headmorph, it's better if you export separetly  the neck too to be sure that you have no seams displacement .

Quote - I couldn't even begin to imagine trying to make morphs on one body part at a time in Zbrush and getting them to then match up properly!

This is a well known issue in Poser and Zbrush interraction -in particular for V4 !
I've found a solution - take a look at my tutorial here
www.sharecg.com/v/19698/tutorial/Poser-7-,-ZBrush-3.1-&-Victoria-4.1
( I should update it shortly but it's a good starting point)

pbellows, your lady is quite interesting ;) -I'm willing to test her !

Alice's and GND4's Tailor !
Check my free clothing fits : www.alizea3d.com