To do this method you need to select the roof and edit the roof footprint.
How to join roofs on different elvels in revit.
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.
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.
First model the 2 roofs.
I think the easiest way to do this is by modelling 2 seperate roofs.
Select the main roof then click on dormer walls and roof.
Changing the slope angle.
To let the jacks sit plumb on top of the sleepers we angled the level cuts to the 3 1 2 in 12 pitch of the shed roof setting the circular saw to a 16 degree bevel the degree equivalent of a 3 1 2 in 12 pitch.
Then from the modify tab on your ribbon use the join geometry command and select the 7 1 2 roof and the wall.
I have uploaded a picture of the cad elevation i was given to produce a 3d and my current revit elevation.
There are settings in revit to make roof edges at different heights but thats a real mess to set up right.
The value can be different for each edge.
Use join unjoin roof tool.
Select the edge and change the slope value.
I have created a single roof with 2 different levels by adjusting the offset from roof in the line properties.
Located in the architecture tab this tool is used to create a dormer shaped hole in the main roof.
Click modify tab geometry panel join unjoin roof.
Use it to extend the dormer roof to the main roof.
If you see the symbol then the edge will be generated having slope.
Creating complex sloping roofs in revit 2014 roof junctions controlling roof slopes and levels.
And then join them together using the join unjoin roof tool in the modify tab.
This tool is located in the modify tab.
Click edit footprint to enter the sketch mode.
Basically the roof is not looking like it should and i do not know what is happening.