If your work PC is "outside", then this is a firewalling question, not a squid question, unless your work PC has a fixed public IP - and even then it should also be a firewalling question. I was referring to access to other servers or services on the INSIDE network that you allow byam looking to access it from my work PC, how can set it to allow only my work PC?
http_access allow allNote that there are ACL types for SRC and DST if you wonder how inside and outside access controls can be achieved.
Regards, Jakob