https://www.godaddy.com/help/add-custom-hostnames-12320
Add custom hostnames | Domains - GoDaddy Help US
Create custom nameservers by adding new hostnames to your DNS zone file.
custom hostnamesadddomainshelp
https://www.godaddy.com/en-uk/help/add-custom-hostnames-12320
Add custom hostnames | Domains - GoDaddy Help GB
Create custom nameservers by adding new hostnames to your DNS zone file.
custom hostnamesadddomainshelpgb
https://www.godaddy.com/help/delete-custom-hostnames-3952
Delete custom hostnames | Domains - GoDaddy Help US
Existing hostnames can be deleted if they're not currently in use as nameservers on another domain.
custom hostnamesdeletedomainsgodaddyhelp
https://developers.cloudflare.com/api/node/resources/custom_hostnames/subresources/fallback_origin/methods/update
Update Fallback Origin for Custom Hostnames | Cloudflare API
custom hostnamesupdatefallbackorigincloudflare