You would need to code something yourself. Gravity Forms works with the data that is submitted by a form, including user registration if you are using that add on. At this point, Gravity Forms has nothing to do with those users, other than the fact that it stores their name and email address.
You would write a single-use script which utilizes the wp_create_user function. http://codex.wordpress.org/Function_Reference/wp_create_user
Read all the information from the entries table that you need, and loop through the data, calling the wp_create_user function each time.
You could use the http://codex.wordpress.org/Function_Reference/wp_insert_user function instead, but the process will be the same. Your script will read all the entries which were collected by your form, and create user records from that data. This is not Gravity Forms functionality but WordPress functionality.
Posted 9 years ago on Tuesday November 6, 2012 | Permalink