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Are you referring to a drop down options for the multiple products? Or do you want to add options for each product?
Please check this thread: http://www.jotform.com/answers/313189#313223
My colleague Mike_T shows that it is possible to have a drop down options for one product using the "add options" in the payment wizard.
Hope this helps. If not, let us know and please provide more details. Thank you.