How to model complex roof

[clauds1223]

How would I model a roof like this, where the roof bends down from point A to point B and where point C is on the same plane as point B?

Thanks

Operating system used: Windows 11

[Laszlo Nagy]

Can you post a top view and a side view as well, with your red lines included in both?

I just want to make sure I get the intended geometry because now you say C and B are on the same horizontal plane, but in your drawing, it seems like B is already lower than C. Also, it looks like there are two point Cs. Also, on the above image, it seems like it bends down from A to the C on the right (maybe you meant point D?), not from A to B.