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Probably easiest to put post on the side of the deck and rails to each post, but without a picture of your deck it is hard to tell you for sure the easiest way.
I will try to add a picture later. I'll have to see if I can get my digital camera working. It does have composite fascia board which we would remove first of course.
So are you saying attach 4x4's to the outer edge of the existing 4x4's?