Currently I am not using sites, SDplus enterprise 7.6

In our company we have 3 groups to support our users.

1. network group (managed by network dept)

2. desktop group (managed by support dept)

3. server group (managed by support dept)

I would like to not include group 1 when I set request closing rules as I do not manage them and they have different processes. I do not see how this can be done so next I thought of creating a separate site. This looks like it will not work as I have to assign requesters to a site and all our groups handle various requests from the same requesters.

Is there something I am overlooking to do this?

Thanks