Migrating a Subdomain

Hello,

I am migrating a couple of my sites from GoDaddy Web Hosting Linux to GoDaddy cpanel. I have successfully migrated one sites but I am stuck on how to set up the database for the subdomain.

For example: I have migrated mywebsite.com but I am stuck on how to set up the database for new.mywebsite.com.

I will try to get more specific.

Under MySQL Database in cpanel- what do I put for the database name? The wp-config.php file for the subdomain has the same DB_NAME, DB_USER and DB_PASSWORD as the we-config.php file for the regular domain. When I input the same username in MySQL in cpanel I received an error saying it already exists.

Thank you to anyone that can help!
-Rachael