DNS host record

We recently successfully decommissioned a child domain. However, we have found a non-domain system which was referenced in the child domain DNS as a host record - xyz.child.root.com
Where can I add this host record in the root.com domain, so it can resolve to services contacting that name?  The child domain no longer exists.
Thanks.

Hi,
What does a non-domain system record mean?
This host record seems
for a computer located in child domain. If this record is for a computer located in child domain, this record will not efficient.
To add a host record to root domain, you can create a new host record in the root domain and input the corresponding IP and record name for the new record.
Besides, after you decommissioned the child domain, you can run dcdiag /test:DNS to check the health of DNS.
Best Regards,
Erin

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