A field change on form affecting following data

I have a fairly lengthy and detailed form that I have finally got to where it should be after a few days of perfecting....all except for one field didn't seem to be calculating so after having about 20 submissions already entered I added a new field that fixed the problem for the remaining 15 forms I did. Question....how can I add the field to the initial 20 without having to enter them all over again. It took hours of work. Any help? Thanks!

Sorry, you mean to say add the same field to the other 20 forms? If yes, use this app to copy fields from one form to another. http://apps.jotform.com/app/field_manager

However, if you mean adding the field to the existing 20 submissions, that's possible but you have to manually edit each submission and submit it again so the values are moved to the new field.

Let us know if I have misunderstood your question. Thanks!