We have a zone setup in our dns which belongs to a partner company. between
us we have a service which is routable internally only (via VPN). we want
to access the service using the same dns name.

We want to add a DNS entry for this service but dont want to maintain the
rest of their zones records. Is there a way to do this in DNS?

zone leedslearningnet.com
internal A record = test.leedslearningnet.com

the remainder of the records A, MX etc.. are resolvable by public DNS
lookups and are not something we want to maintain.