Extended roof over inset porch

[BDobyns]

I have an addition that has a double garage and family room both sharing the same gable roof. The family room has an inset porch across the front. I want to extend the roof about 2 feet beyond the front of the garage to make a deeper porch without talking space from my family room, and I want to keep the roof plane the same - just extend the front of the roof along the deeper porch. I have attached a photo of a house that has the extended roof I am after. When I try to select extend roof on the porch dialog box it changes the entire roof over the room and it is no longer continuous over the adjoining garage, which I do not want to do. I am a novice and still have much to learn (like how to put a foundation under the garage and piers under the porch columns - but those are for another topic.) and any help would be greatly appreciated. My software is Home Designer Pro 2021. Thanks!