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ok, this may sound overcomplicating but I have a need to convert an old information archive into something more dynamic and that supports a search engine (standard vb search engine will do).
Basically I want to move every manual (docs or ppts), infos (i.e. contac numbers, errata from manuals or catalogues), guides (with screens or attachments) or simply some printable modules for the agencies of my network. They could be easily copy-pasted into individual threadswith attachments organized in a similar way as in the old archive. Please consider neither of those groups can upload informations in the web-archive. Only moderators can, and I'd like to preserve this limitation.

The problem lies in the fact that due to my company infrastructure, in the old archive I had the chance to individually set visibility for a single object for employees, affiliates, or both.

On VB it seems I can't set visibility permission on single threads.
I would like to avoid to double the forum & subforum structure only because some files/infos cannot be shared among both user groups.
I could consider using specific moderators to post in that forum, but I'd like to see messages from the employee mod to be visible only to users under employees group and messages from an affiliate mod only visible to affiliates. An admin will be in both groups as "additional groups" and his messages would be visible to both groups.

is that possible at all?

I know of no modification that allows you to set only certain threads to be viewable by usergroups. You can easily set up forums that are only viewable by certain usergroups. Perhaps you want a parent Forum A that is viewable by both usergroups and then have two subforums, Forum B and Forum C, and only allow one usergroup to view each?

Yes, that would be the solution I'll most likely use in case what I ask is impossible to do. But I fear I'd end up creating dozens of sub-sub-forums in order to recreate the same structure of the archive... Maybe I should rethink about that...