To do this method you need to select the roof and edit the roof footprint.
How to join roofs on different elvels in revit.
Basically the roof is not looking like it should and i do not know what is happening.
I have tried creating 2 roofs and joining them but have had trouble with this as well.
Select an edge of the roof that you want to join and then select the wall or roof to which you want to join the roof.
Use join unjoin roof tool.
Select the main roof then click on dormer walls and roof.
Select the edge and change the slope value.
Click edit footprint to enter the sketch mode.
This tool is located in the modify tab.
Creating complex sloping roofs in revit 2014 roof junctions controlling roof slopes and levels.
Changing the slope angle.
Then from the modify tab on your ribbon use the join geometry command and select the 7 1 2 roof and the wall.
And then join them together using the join unjoin roof tool in the modify tab.
If you see the symbol then the edge will be generated having slope.
There are settings in revit to make roof edges at different heights but thats a real mess to set up right.
Create a dormer opening.
Click modify tab geometry panel join unjoin roof.
It will join in the wrong order and you will need to use the drop down menu next to join to switch the join order.
I have created a single roof with 2 different levels by adjusting the offset from roof in the line properties.
To make the bottom cut i laid out a level cut for a 4 in 12 pitch.
Use it to extend the dormer roof to the main roof.
First model the 2 roofs.
I think the easiest way to do this is by modelling 2 seperate roofs.
Select the wall and use the attach top base button to attach it to the underside of only the 5 1 2 roof.
Located in the architecture tab this tool is used to create a dormer shaped hole in the main roof.