We currently have a DNS structure with a Primary domain and around 14
secondary domains. The Primary domain just resolves addresses locally and
does not do any external domain name resolution which we want to change.

Can anyone give me any guidance on how I change our setup so the Primary
domain can resolve external DNS addresses through our ISP? Is this just a
case of setting up forwarding with our ISP's DNS on the primary domain?

Sorry if this has been covered before.

Kind regards,