Artica or cguard services use their own categorizations, they are fixed to correspond to a set of categories most used in the world (porn, gamble, malware, spyware...) but they may not correspond to your need because you must use another categorization system.
Personal categories can be used by the proxy with the Web-Filtering service ACLs categories objects, DNS firewall and feed the categories service
Personal categories can be found in Filtering service > Your categories