You should just be able to create NS records in foo.com
called bar
and enter the nameservers (one per entry) they gave you. That's called a "zone cut" and anybody looking up, say, baz.bar.foo.com
will be told by foo.com
to check with Cloud DNS (the same way com
told them to check with foo.com
). When they ask Cloud DNS, they'll get the answer.
So -
- Set up the zone
bar.foo.com
on Google Cloud DNS - Add
NS
records atfoo.com
listing the Cloud DNS nameservers given - ... that's it! Try it out.