ACS RADIUS Config

[ports]

Hi All,
I am trying out the following scenario,
Switches: Nortel Baystack 460 (250 No's)
RADIUS server: Cisco ACS 3.2

RADIUS authentication works fine, with ACS
if service-type=administrative (Full control)
if Service-type=NAS Prompt (Rad only access)

How can i do the following on the ACS Server,
Assign 2 users i.e USER1 & USER2 to the same group i.e ADMIN group.

But selectively give service-type based on the the IP address they are telneting to.

for example
User1 Telnets to 10.10.10.1 he gets service-type = administrative


User2 Telnets to 10.10.10.1 he gets service-type = NAS prompt

Both users i.e USER1 and USER2 belong to the same group.

Has anyone tried this? would apprecaite any inputs on this.

Thanks and Regards,
FG