hfother307 wrote:
The finished opening right now with the threshold is 69 1/2 Wide and 77 1/2
High. I would like toinstall a sliding patio door here between my three
season porch and the main house to prevent heat loss. I believe that I
need a rough opening of 72 x 80. Any recommendations?

Chuck

not enough info here to answer. the first question is what exactly is
the rough opening when you remove any finish materials. then, is it a
bearing wall, and is there a header? maybe there is a filler piece
under the header. if it's not structural, you might be able to remove
the trimmer studs. lots of possibilities but we need more info.