I need some help and direction. I understand floor plans and the basics. I'm a user for about 6 years. I draw existing houses and try to get them as accurate as possible. I struggle with roofs and today dormers. I can place a dormer in the attic without issue. I want to place it on the 2nd story, but the roof starts on the first story. Think shoebox with and 8/12 pitch, with a smaller second floor. When I add the dormer the interior walls of the second story return to OSB. If I take the dormer away the room returns to sheetrock. Can someone point me to some specific videos or help?