I am trying to add a shed roof over a front porch and also a back deck/screen porch. When I do the 3D view it only looks like a deck with railing on both front and back, therefore I an unable to get a roof because there is nothing to support it. How do I extend the railing timbers to support a roof. I have attached the plan so someone can see what I did wrong.
I am using Home Designer Suite 2016
Whiteoak Cabin.plan