DAZ3D sells a head & body morph package for Vicky 3 which is the core content for changing her head & body shape.  The link is below:

http://www.daz3d.com/i/3d-models/morphs/victoria-3-0?item=3008&cat=62&_m=d

By having this core content present in the main Poser runtime, any character content you apply will refer to these 'morph' files to physically change the model's characteristics.  Usually, these morph files can be found in the Pose folder of your library.