Here's a little background before asking my question just in case my set up is not optimal.

I have several customers that I moving to my support site.

Since i was not able to split them by organization (unless I'm missing something) what I did to mitigate was to create "Departments" with which are essentially my clients' organizations.

I am trying to limit access to users(contacts) by their specific department such that:

Departments:

- Company A

---- User 1

---- User 2

---- User 3

- Compnay B

---- User 4

---- User 5

- Company C

---- User 6

Please note that these are NOT agents. These are portal users who need to submit tickets.

Is this possible?