That's what you use the Pose libraru for :o) Once you've made (or downloaded/bought) a sitting pose for V3 you can use it again and again, as long as it's saved in your Pose library first. Or did I misunderstand what you wanted to do? :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.