Hiya
MS DHCP is in use here , just create a new scope but with the default gateway as the new address of the remote router that needs a DHCP address, if you have a static set of addresses assigned to a site you can put those as the scope range ie 10.2.22.0 - 10.2.22.150 this will give you 151 addresses

I will dig out the notes for cisco routers and post or would u prefer email ?

I am located Uk and work for NHS + U ??