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Unfortunately it is not possible to clone existing form along with its submission data but with with a little workaround, it is possible to achieve your requirement. Here are the steps you should follow:
#1. Clone the existing form you have in your account. The following guide should help you: http://www.jotform.com/help/27-How-to-clone-an-existing-form-from-your-account
#2. Export the submission of your main form in excel format: http://www.jotform.com/help/44-How-to-Export-Form-Data-to-Excel
#3. Take advantage of our "Import App" to import data from excel file to your cloned form: http://www.jotform.com/help/308-Import-App-Easily-import-your-Excel-or-CSV-data-into-JotForm
Hope this helps.
Do get back to us if you have any questions.