Copy submissions from a different account

Do you mean to merge the submissions of two forms? If so, was one of these forms are cloned by using the other or having the same fields? In this case, you may use the Import submissions app to import the submissions of a form to another using Excel or CSV format. Please refer to the guide below that can help you with import submissions app. 

https://www.jotform.com/help/308-Import-App-Easily-import-your-Excel-or-CSV-data-into-JotForm

If you are referring to something different, please let us know. We will be happy to assist.