How to extend bottom chord of attic truss out beyond exterior wall?

[Dingeling]

Hi,

By default, CA generates a roof where the bottom chord of the roof truss is only as wide as the two walls it rests on. The rafter tails extend to create a roof overhang, which can be boxed if you want.

I would like to utilize the attic space to create additional living space, and to increase the available space a little - particularly the height - I'd like to extend the bottom chord of the trusses out 500mm beyond the walls they are resting on. (The extended bottom chords would then automatically create the boxed overhang effect, without need for rafter tails).

How do I do this in CA?