You need to create the bay window roof separately.
Revit attach beams to inside of roof.
Automatic beam system creates a layout that is used to control the number and spacing of a series of parallel beams.
Revit structure placing beams on a sloped plane you will first need to create the sloped named reference plane see video here.
Tile this view with the plan view at the level of the beam system.
Then choose attach top base 2 and finally select the roof 3.
This is a general.
You can join roofs to other roofs or walls or unjoin them if they were previously joined.
There are a lot of things to consider when align beams to.
You can join a roof to the top face of another roof and the wall below that roof if you select the wall as the target.
Select the element and choose modify sub elements.
2 select one or more trusses to attach.
This is the easiest way to do it.
Add to group adds elements to a group.
Sloped reference plane next go to a view where you can see all of your columns i generally use the site plan view for this you will want the columns placed prior to placing your beams.
In the plan view go to the home tab work plane panel and choose set.
We can use the same attach top base tool to tidy up this junction.
Use this to add slope to the roof floor.
My final step is to clean up the intersections.
These are some of the various process i ve been using in revit.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
Roof by footprint can be used for both flat and sloped pitched roofs.
I believe this tools are not design for this purpose.
Aligned dimension creates an aligned dimension.
I then drew a second roof with a 7 1 2 thickness on the inside of the first by using pick walls with extend into wall to core checked on and no overhang.
Open a section or elevation view showing the roof floor.
Cancel cancels an action.
Using shape editing tools.
Once again select the wall first 1.
Revit then makes the wall meet the underside of the roof correctly.
Draw the roof or floor element.
You cannot join a roof to more than one top face of another roof.
Select the wall and use the attach top base button to attach it to the underside of only the 5 1 2 roof.
But i m not really sure if this is a best practice.