Thanks everyone, I had completely forgotten what I was supposed to be doing. I do have all those tutorials bookmarked or saved but for some reason I was being quite dense about it. Finally it clicked when I read this post in the Hivewire forum (not sure if I'm allowed to post here). In case anyone else is having the same problem it's in Forums: Learn and Practice: Software: Poser: Pulling Back the Drapes: The Cloth Room, a thread started by VortigensBane. So, here's my result:

In that thread VortigensBane says to move the whole prop so that the selected vertice in the choreographed group is where we want it in 3D space which is fine when you have only one point. My question is what happens if I have two separate vertices? For example I want my character to lift both sides of her dress and curtsey like this:

Has anyone done or found anything similar in a tutorial, preferably dumbed down and step by step. :) Thanks!

Oh, and I nearly forgot. In my attempt above the dress is being pulled from the torso which looks a bit unnatural. How can I get it to look as if it's being lifted only from the skirt part? When you lift below the hip the torso doesn't necessarily follow. Should I constrain the torso?