Cisco and RADIUS

[vignesh]

Hello all
I am new to RADIUS. I am using Cisco IP IP gw as NAS and RADIUS. I have
few doubts regarding the interaction between CISCO and RADIUS
Whenever the request for authentication comes, for all authenticated
users I wish to send some extra details like 
Billing model, credit time etc. If I make changes in the authentication
query to return these values, how will the nas understand that which one
is billing model or which one is credit time. Do I have to make any
changes in the Dictionary or RADIUS. I tried to search for the same in
CISCO site but hard luck couldn't find it. Please guys help me out

Thanks in advance
Vignesh