Hey Vanman:
You could set trusses over the patio, string the ridge line back onto your roof, put up a ridge board (2x6), mark rafter spacings, chalk lines on the roof from the truss end to the top of the ridge board and fill in the blank part onto your existing roof. You will have to measure each rafter and make some squirley cuts but I'm sure you can do it (and Home Depot says they will help).
Glenn
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