On the next screen, you must specify the subdomain you want to add.
Once you click the Save data button, you will see that the subdomain has been created successfully. In this example, the subdomain "test.example.org" has been created.
The subdomain will not have any user assigned for its update, so you must link it to one of the users you have created or create a new one through the corresponding section , where you can access it using the "User" button. You can create as many subdomains as you want, including nested subdomains.
To do this, simply click the "Create A record" button from the record where you want to create a subdomain. Each created subdomain can be assigned to a different user, and each user can be used to update the IP from the terminal where it is validated.