@ PapaBlueMarlin:  Latexluv and Ice-boy are correct.  If you need to apply VSS to both models in your scene, apply to one, save and delete.  Similarly, set VSS settings for the second model, apply and save.  On the other hand, if you only want to apply VSS to one model in your scene, change to rule node in Preview to refer exclusively to your named model.  Make sure that the model is named exactly the same way under properties.