To Set Permissions for All Documents in a Folder

Select a folder.
Select Folder > Properties.
On the Folder Properties dialog, select the Document Security tab.
Set Security Type to Folder.
Click Add to add a user to the Name list.
Select the user in the Name list, then turn on/off permissions for that user as needed in the Permissions list.
Do one of the following:

Click OK.

or
Click Add to configure more users' permissions for the folder.