How can we apply Folder Level Security for a particular user group?

Hi All,

I am new to CMC . I have a security issues in folder level which is not getting resolved.

If there are around 10 folders (Ex: A,B,C,..) under public folders given access to  10 user groups (Ex: A1,B1,C1...) respectively.

If A1 user group has to see only A folder and B1 user group has to see only B folder and not any other public folders, how should i grant the access?

I have seen a forum where they were telling to remove the access of "Everyone" group from each and every other public folder which the particular user group does not need access.

If the number of folders keep on increasing then it would be a very difficult task. So is there work around procedure for this. Please help me.

Thanks in Advance.