How to add more prices to one item?

Dear OpenCart developers, is there any extension that allows me to add several price tags to an item so I can select them via a Combo box?

Do I need an extension or do I have to change anything in the code?

Any information would be helpful.

Thank you.

you can use options to add or subtract amounts from the default price an they will show up in drop down lists.

Oh, that's right, I could just set the price at 0 and then create options that add to that value.

Thanks.