Regarding the Poser models. Simply save them as pz3-files (native Poser format) and import those into Vue. As simple as that.

But not always.
Sometimes when I load / import Poser 5 scenes to Vue 4
then all textures are lost and the object is just
default grey. But sometimes it works fine. Maybe Vue 4
can't handle all of these advanced P5 shader nodes?
Maybe, I find out sometime.