How to combine a Landscape document and a Portrait document and retain both orientations

I need to create a duplex brochure that is
Brochure.png (104.8 KB)

on the other side. I have tried:

PageInfo pageInfo = document.PageInfo;
pageInfo.IsLandscape = true;

I have tried creating two different documents, one Landscape and the other Portrait. When I combine them with document.Pages.Add(doc2.Pages); the Portrait page gets rotated to Landscape and it won’t print correctly. I have attached an image.

@LeeHearn

Can you please share your source PDF document along with desired output results? We will test the scenario in our environment and address it accordingly.