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Eric, I have looked through but as of yet have found nothing pertaining to my question above.  I am a beginner user just so you know.

how do i create it on top of the existing structure?

i have an L shaped house that i want to design an open gable in the corner of the L. the house is a hip roof and my beams for the cover 1 ft above the 8 ft plate line.  i want my gable  roof structure to sit on top of my ceder beams.