- Login to UltraDNS
- Create the subdomain as a primary domain in UltraDNS
- Add desired records to the subdomain in UltraDNS
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Contact the other DNS provider to determine how to add NS records on their name servers
- You will need to add NS Records with the subdomain's name as the host name in the apex domain's zone file pointing to your UltraDNS Name Servers.