how to put a host into DNS subdomain?

[lejeczek]

hi everybody

I'm trying something simple, or I thought it'd be simple
for organizational, or for test if you like, purposes I 
would like to have

subdomain.inparent.zone (so no delegations, just in parent 
zone) - this works with nsupdate simply:

 > zone inparent.zone.
 > update add host.subdomain.inparent.zone 86400 in a 10.10.1.10
 > send
$ host host.subdomain
and it resolves fine, and if I fix my resolv.conf 
respectively it even resolves host

but I don't know how to achieve above with dhcpd + ddns.
Would it be the hosts(dhcp clients) I should be looking at?
Ideally would be a capacity to do it inside dhcpd.

many thanks.