The different methods of override
There are actually two different ways to override web filtering behavior based on FortiGuard categorization of a websites. The second method has 2 variations in implementation and each of the three has a different level of granularity.
1. Using Alternate Categories
Rating Override
This method manually assigns a specific website to a different Fortinet category or a locally created category.
2. Using Alternate Profiles
Administrative Override or Allow Blocked Override
In this method all of the traffic going through the FortiGate unit, using identity based policies and a Web Filtering profile has the option where configured users or IP addresses can use an alternative Web Filter profile when attempting to access blocked websites.