You will need to create these groups as either Active Directory or Local Server groups and then assign your users as members of these groups. Once you create the groups you assign the users permission to specific folder and to certain roles for each folder (you can customize the roles.. take a look at http://www.mssqltips.com/sqlservertip/3064/sql-server-reporting-services-report-builder-2012-security/[/url] or http://technet.microsoft.com/en-us/library/ms155843.aspx) .