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Are you referring when downloading your submissions data?
You only need to download some fields, not all of them, is it correct?
If this is correct then you can download only the fields that you need, please take a look on this guide, you will find the steps to create an Excel report and you will be able to include only the fields that you want: http://www.jotform.com/help/101-How-to-create-an-Excel-Report.
This link will provide more information about the reports that you can create in JotForm: http://www.jotform.com/help/326-How-To-Create-Form-Reports-in-JotForm.
If it is not what you are looking for, please provide us a bit more, we will be glad to help you.