Based on your description, did you want to create an Excel Workbook with forms, after user enter data they should save the Workbook as .pdf file format. After saving the Workbook will generate a new and blank Excel Workbook with the same forms? Is my understanding correct?
If yes, in my opinion you can try to create a template in Excel:
Users should save the Workbook as .pdf file format manually, just checking in to see if the information was helpful. Please let us know if you would like further assistance.
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