You mean something choose options that related costs?

Like this:
Ticket Class: (x) Normal  ( ) Premium
Include: [ ] Breakfast  [x] Lunch  [x] Dinner
Total Price: $25
You can customize by JavaScript, may be. But that is not easy way. (If you can do that, you not ask here, I think.)
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Nobuhiro YASUTOMI (MySite Users Webmaster)