I do not want to have full R/W replica of the Root

Still had no luck with my questions above:

I simply need to know:

Can I have filtered replica & if so then the classes are not a problem to
chose (all
DNS\DHCP related), but which attribute per each class???

Also is it possible to have filtered replica of only these objects on server
with NW 6.5 SP2 when the master replica is still on NW 6 SP4 (e-dir 8.6.2
Version 10350.30 15 December 2003)

I really want to move the DNS/DHCP to another box some time soon

Thanks for any input