Dear Angel,
the Rule logic will be crucial here, how you have your rule set configured. If you say block everything which is not category "Business" the result will be the same as you describe. When you designe your rule set to allow category "Business" and choose action "stop cycle" - the engine will only check if the category is Business and wont check for any additional. The effect will be that your users will get Access to all sites which have either first or second category eq "Business".
-Sergej
Best Regards,
Sergej
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