Poser 2 is very different from 4 .. I don't beleive there is any useful way to translate what 2 did. However ... The poser 4 people do not come with heavy and thin morphs. SO you would need to find or make morphs to do that, or use scaling of bodyparts for smaller changes. There used to be some bodyshaping morphs for the poser4 figures in freestuff here. Or, you could buy Michael 2 and Victoria 2, which do have a wide variety of bodyshaping morphs. Then your next issue will be making clothes fit the newly shaped bodies, for which I recomend the Tailor, also by DAZ.