First of all create a reference plane in desired position and if you like lock it to the roof plane this way if you raise the roof the purlins etc.
Revit join roof planes.
Edit the roof sketch.
Choose plugins instant roof make roof.
I believe this tools are not design for this purpose.
Will go with it.
Double click the roof or select the roof and click modify roofs tab mode panel edit footprint or edit profile.
This is the easiest way to do it.
Draw a couple of attached boxes representing a main building plus a building extension.
6126 gambrel roof.
6125 shed roof.
6124 gable roof.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
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In the pop up menu then choose calif ranch from the roof style pull down menu.
If you want to change the position of the roof use the properties palette to edit the base level and offset properties to change the position of the reference plane.
Choose ok to accept default parameters and generate the roof shown.
9 join roofs add opening to create dormer.
This tool is located in the modify tab.
Plane if you don t none of this works.
Using shape editing tools.
Click modify tab geometry panel join unjoin roof.
Use it to extend the dormer roof to the main roof.
Two roof or ceiling planes can be joined at adjacent edges in both 2d and 3d using the join roof planes edit button.
You need to create the bay window roof separately.
Select the 2 top faces.
To create a dormer model required walls and additional roof.
6123 hip roof.
Now the trick is select and name the ref.
5447 roof basics.
But i m not really sure if this is a best practice.