How do I allow access to some URLs in a 'blocked' category
From Netintelligence Knowledge Base
To exclude URLs from blocking, create a custom category (using Custom Web Categories) and add the URLs you want to allow into it. The custom category will now be available for you to use in your customised policies.
If you want to allow access to these URLs for all users, set the newly created custom category to Allow in your Default Policy. Please note that it can take up to 20 minutes for the Netintelligence Client programs to update with this policy change.
If you want to allow access to these URLs for specific users, you can use the new custom category in the same way as existing categories, by either editing existing policies applied to existing user groups, or by creating a new user group and a new policy and applying the new policy to the new user group (using Group Settings).