Are you wanting a dropdown that allows multiple selections? If so, that's not possible. A list box can be set up for multiple selections, but it would be difficult for a user in this case I think. I'd either stay with check boxes (clear and easy for users), or perhaps a custom dialog that has multiple check boxes and place the selections in a read-only text field.
Yep "Dropdown with multiple selections/money values" that's what i was after. Had no idea if it was possible or not so thanks for clearing that up for me. Cheers.
A dropdown is used for mutually exclusive items (ie, you can only select one of them). I think that in your case you can use drop-downs for everything between Name and Additives. The former should be a text field, of course, and the latter a set of check-boxes (use a different field name for each one, so they're not mutually exclusive).
You can assign a numeric export value to the items both in a drop-down and to check-boxes so that calculating the final cost is then easily done.