Re: Delegation for DHCP server on DC
What Blood suggested should work. You could use MMC and the DHCP snap-in after that.
One thing to bear in mind though for DHCP installed in the DC is that the DHCP administrators group becomes a domain local group and as such you give the user the rights to administer any other DHCP servers installed in other DCs as the case may be. More on that here: http://support.microsoft.com/kb/887357