The cloned account feature creates a new account identical to the one you cloned, except for the username. The cloned account will have the same default contact, nameservers, and security information as the parent account.
Why should I use a cloned account?
Cloned accounts should be used by users who would like to have an account for individual TLD's (i.e. .com's in one account and .net's in another) or related domain names (i.e. geographical domain names in one account and service related domain names in another).