If you're wanting a sub-account(s), here's the process of requesting an UltraDNS sub-account created.
Keep in mind the account will inherit the advanced services, account usage and service package of the Parent/Main account's billing ID, and will be billed to the Parent/Main account. If you're wanting a sub-account with different services or billed differently, you must first reach out to your designated Vercara Account Manager.
Provide the name of sub-account, the username Name wants along with their contact and company info for email/phone verification when contacting UltraDNS Support.
Web Forwarding (default is No - unless the Parent/Main account services has this enabled)
Traffic Management (default is No - unless the Parent/Main account services has this enabled)
Advanced Directional (default is No - unless the Parent/Main account services has this enabled)
Pending Authorization (default is No - unless SAML/SSO login authentication is going to be used)
Nameservers - if you're wanting to use a different set of nameservers for the zones in the new sub-account, you'll need to provide those. Otherwise the sub-account will use the same nameservers of the Parent/Main account.