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If your making an excel report, you can manually separate the purchases on a new cell or row.
But if you are looking on separating them automatically, unfortunately, it is not possible.
If you wish to show each product on separate columns, in an excel report, that's possible if you'll recreate the products using the plain form fields instead of adding them directly in the payment tool.
Using text boxes, radio buttons and other field types, you can calculate the price using form calculation widget then passing it directly in your payment total field. If you'll use radio buttons or check boxes, you can assign calculation values on their selections, here's a guide: http://www.jotform.com/help/301-How-to-Assign-Calculation-Value.
I hope that helps.