There's a couple of ways you can do it. Make sure you are in a Double-sided Job setup. Make sure the model is centered, then right click and copy to other side. Go into the Modeling tab and adjust the shape height under Component Properties. Under the component tab, ADD a Tab level and a Zero plane level. In the Zero Plane put a negative number to adjust for the amount of undercut. The Tab level you can add tabs from the clipart.
Another way is after you have doubled it and adjusted the thickness, export the model out as a stl file. Then import it again and the Component setup with the Levels will already be in place.