As long as you re-save your Poser file, then a pop-up will appear in Vue saying something like "this has changed, do you want to re-import it" and you say yes and it re-imports the poser file with the changes.
This doesn't affect the rest of your scene, just the Poser import!

Hope that's clear, I'm not good at explaining stuff at times!

Injustice will be avenged.
Cofiwch Dryweryn.