I'd like to create some different group, because in some of this i'd like to hidden several users.
Who is reached this point by the integrated Cloud address book?
You can't (yet). Who knows, maybe in the future.
There are some threads about this in the community. Just do a search on hiding users and directory.
Here are a couple of the ideas focused on this, please vote:
Organize Directory and Contacts into Groups
Manage the Availability of Entries on Lifesize Cloud Directory
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