If you are using Parallels Pro Control Panel as a DNS server, you can create a virtual name server to act as a slave DNS name server. This satisfies the requirement that you must have two DNS name servers to create a domain.
Be aware that creating a virtual name server does not actually provide redundancy because you are requesting Parallels Pro Control Panel to add a second IP address to the specified master name server. Since the IP address of the virtual slave server maps to the master server, if the master server stops operating, the slave server will as well.
To specify a virtual slave name server:
Note: After making changes to the domain name server, you must restart the name server for your changes to take effect. It may take up to 48 hours for your DNS changes to be visible on the Internet.