Restricted access to a folder

Hi, all

I have in Designer Collaboration ( cfolders) one structure of folders similar to the following:

Main Folder

Public Folder

Restrict Folder

And this is my problem: I have that in the Public folder is general information in the folder Restrict information is restricted for many users, then I need to give access to the folder Restrict a certain group of users and the Public folder that all users have access

Any idea how I can do this?

Thanks for the help extended