For example you want to allow your users to access www.bbc.co.uk but do not want them to access iPlayer. As iPlayer is a Subdirectory and not a subdomain we can not just add it to the domain block list or a custom category you may have set up. The best way is to create an Exception.
Log into your web filter.
1. Navigate to BLOCK/ACCEPT.
2. Select Exceptions.
3. Create a Block rule. Under Category select URL Patterns. Under Sub Category/Expression enter www.bbc.co.uk/iplayer
4. Create a Allow rule. Under Category select Domains. Under Sub Category/Expression enter bbc.co.uk
Make sure the Block rule is above the Allow rule as Exceptions work from top down. In this case it will Block BBC iPlayer but then allow access to the BBC website.
You can find more information regarding Blocking Domain Subdirectories in the following Barracuda KB article here.