If the material is thicker than the model you are machining, you can also tell ArtCAM MillWizard where about in the material to place the model.

Do you want the highest part of the model to be just below the surface of the material? Or do you want the lowest part of the model to be at the bottom of the material - wherever you want to position your model, simply move the slider to see the models position in the material displayed on the screen.