Can I import data from one form to another?

It is possible by downloading the submissions as an excel or csv file and then importing it to another form with the use of the Import Data app.

Here are the guides on how to download the submissions:
How-to-Export-Form-Data-to-Excel
https://www.jotform.com/help/103-How-to-create-a-CSV-Report

Now here's the guide on how to use the Import Data app:
Import-App-Easily-import-your-Excel-or-CSV-data-into-JotForm

Hope that helps. Thank you.