MichianaDesign

Can someone help me create a custom countertop that aprons down the ends of the island, I tried this by converting to 3D symbol and was able to manually pull it down the ends but then it didn't stay when I converted it back to a countertop, If I leave it as a 3D solid it doesn't show the sink opening in 3D view, any help with this would be great, I'm using (X17)