How to use squid proxy in a network with ACL from other network

[markxus]

hi I'm a SquidNT 2.5.STABLE14-NT (windows based)

i have to networks in two places.

In the network (A) WHERE is running the squid proxy, all it's ok.
But i want to use the same proxy for the network (B).
In router A i did a NAT for redirected the port proxy to a private ip:
ip nat inside source static tcp 192.168.1.2 3128 (public_ip) 3128 extendable

And got use this proxy in network (B)
But that i want is identify the privates IPs in network(B) for do ACL's with ips groups for allow or deny services how exists in network(A).

All net(B) out to internet with an unique public IP:

ip nat pool NET_B unique_publicIP unique_publicIP prefix-length 28
ip nat inside source list 10 pool NET_B overload
access-list 10 permit 192.168.1.0 0.0.0.255

But how identify privates IP in NET(B) for to do ACL in the remote PROXY???????

Any help pleaseeeeeee!!!! thanks a lot.