purge form data

Can you purge data from a current form without creating a cloned form?

If I understand you correctly, you would like to delete all entries that have been submitted in your form. You can delete all the submission from your SUBMISSION PAGE

At the bottom you will notice a grid. Here you can download or delete all entries. Please keep in mind if you delete the entries they will be lost and will not be able to be recovered. I suggest you make a backup by exporting all the data in an excel or CSV.