How can I transfer a registration on one form to another form?

Do you mean to transfer registration submission data from one form to another?

You can automatically pass form data from one form to another.

Please refer to this link to know more about it:

https://www.jotform.com/help/351-How-to-Automatically-Pass-Form-Data-to-Another-Form

If you have any further query, please let us know.