Working with backup sets : Microsoft SQL Server database backup sets (Windows) : Restoring a Microsoft SQL Server database backup set : Specifying the database(s)
 
Specifying the database(s)
• On the Select directories/files to restore page, browse the Database Tree, select the items you want to restore, and then click Next.
F1 Help: "Set Properties - Options tab (Windows database backup sets)"
– To view and/or select individual database files, select a database, and then click Show Files.
– To see the total size and number of files selected, select Calculate amount.