In Zoho Desk you can show tickets in the help center, is there a way to limit it so that only a subset of users can view tickets submitted to a department or is it all or nothing?

Concept is Department 1 is a general use department and the default for the help center. Department 2 is a special use department, where only a subset of users should be allowed to view tickets in it. Some of the help center users in Department 1 may be referenced in Department 2, but they should not see the tickets associated with Department 2. 

I see KB's can be locked down by groups, but wondering if these same groups could be used to lock down permissions to help center Department access.