You can also use your TiW card toward any appetizers you want as well. It's very flexible. We have done this in the past when we had the DDP for free.....used the plan for the entrees and desserts and the TiW for appetizers and any beverages not included in the DDP. Just let your server know so they can separate the charges appropriately.
We did this recently and some servers were better than others at charging us correctly. Make sure to mention what you want charged on the TIW card and what should be covered by the DDP at the time of ordering.
Remember too, that the tip is NOT included on your DDP costs/receipt so you need to add that, but 18% IS included on the items on your TiW receipt already. You need to pay attention to each separately.