Summary : SharePoint 2013 – Set Unique Permissions for Folders and Documents,Break Inheritance for Folders and Documents,Manage Permissions for Folders and Documents in SharePoint 2013
Like earlier versions of SharePoint, In SharePoint 2013 you can set unique permissions for Folders and Items\Documents using the “Shared With” option. It is not that straight forward and it took me few minutes to get to the desired screen. Click on the “Call up” menu or “…” of folder or documents that you need the unique permissions on. Click on “…” further as shown in Fig. below and then select “Shared With”.
Next click on “ADVANCED”.