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Could you please give us a bit more details Neal?
If you were to create a PDF form in the Adobe Forms Creator, you could import it to our system using the Adobe Import Form page her: FormsCentral Alternative: Import Your Forms and Form Responses to JotForm
You could then export the same form as fillable PDF using our Fillable PDF export tool: The Fillable PDF Form Creator
I believe that if you are importing and exporting - in a circular manner, that it might remove some options from your jotform and that you would need to change them if they are not the same as the default ones.
You would also loose conditions (at this time) and all email templates set up in the email notification on the new import.
If you meant to go the other way around - export from jotform and then edit in the Adobe Forms Creator, then if it can open the PDF file, you should be able to change it, as long as you do not modify the PDF calls to our back end.