LawB10,
The polyline that you were referring to was the gable roof line that I had manually added to get the hip roof to extend it over the porch. While removing it and changing the settings on the walls does generate good hip roof and porch roof, it doesn't completely give what I was after, which was the porch roof, and the extension of the hip roof.
The attached pic shows on the right what I get with your method, and on the left what I was after, which I was able to get with Eric's suggestion, which is available in HD Pro.
Thanks,
Alvar