How To Set Share Permissions On Sub Folders On Mac OS X
Sharing files between multiple users on the same Mac is one of the benefits of Mac OS X. The operating system makes it easy to manage file permissions for files and folders so you can rest assured that the right users will have access to the files that they need. In addition to giving users access to files, you can control whether they can merely read the file or have the ability to change it.
Select the folder containing the sub-folders on which you would like to change the permissions.
Click "Get Info" from the "File" menu.
Select the icon of the lock in the bottom-right corner of the window that has appeared, and enter your administrator password.
Click the "+" icon in the lower-left corner of that window and select the user (or users) you would like to give access to the enclosed files, and click "Select." Click the menu next to that user's name in the "Privileges" pane to control whether that user can "Read only" or "Read & Write."
Click the gear icon at the bottom of the "Get Info" window and select "Apply to enclosed items..." to apply those permissions to enclosed items.