Categories 123:
- everyone: full
Categories 456: 
- trust_level_2: full
- vip_b: full
- staff: full
Categories VIP:
- vip_b: full
- vip_a: full
- staff: full
vip_a Muted Categories: 123
With this setup, vip_a users are not prevented from seeing the 123 categories if they are linked to them or search them out, but they will not show up on the homepage. âEveryoneâ really does mean everyone - they could just log out, after all.