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You will be able to select more than one face to the selection, use A (for add) and R (for remove) while making your selections, dont hold down the A and R as A puts you in "add" mode and R puts you in "remove" mode. Please note that whenever you select a face, it always grabs two, the one you need and an adjacent one because the edge you pick is part of two faces. What you can do is to select everything you need and then press R and now pick all the unwanted faces to remove them from your selection, if by mistake you remove a face that you need just press A and you will be back in "add" mode.
Hope this helps.