The search index could not be updated. The site is misconfigured. Contact an administrator. SQLSTATE[42000]: Syntax error or access violation: 1064 unknown table 'tiki_main_67e2559f7089d' in delete request
Unfortunately Tiki cannot do what you want yet. The closest thing we have is assigning permissions for categories. This feature is only found in 1.9 which is currently in the RC phase.
See CategoryPermissions for more info (that page needs some work, I know 😡)