Folder access level with reporting rights

Hi Friends,

I need to assign Folder level security to three Groups

Groups    =   Group Red , Group Blue ,Group  Brown

Folder=        SD MM   & PM    

Group Red  has to be restricted to

Access Folder: SD folder  in EXECUTE mode only (he can execute what ever the reports are there in folder)

Group Blue has to be restricted to

Access Folder: SD Folder in EXECUTE mode only (this folder executing report not for creating)

Access Folder:  MM folder in EXECUTE/CREATE mode (this folder executing & Creating report)

Group Brown:

Access Folder: SD  in EXECUTE/CREATE mode

Access Folder: MM l in EXECUTE/CREATE mode

Access Folder:  PM  in EXECUTE mode only

please  suggest how to restrict  the folder . the  Hierarchy like

this

Corporate

                ----SD

                ----MM

                ----PM

Thanks & Regards