attic vs. floor / rafters vs. trusses

[Linkrete]

I am building a 2 story building with a 10/12 pitch roof. The roof has two fake dormers and a window in the gable end for looks only. The problem I am experiencing is that the area above the second floor is appearing as an "attic". When I try to create trusses I get rafters (so that the attic is a usable space). In reality there is no attic it just has that appearance and I need trusses instead of rafters to appear on the plan. I should point out that I did use the "hole in roof" method of building the fake dormers. Perhaps this caused the area to be defined as an attic.

Thanks again for any help and advice.

Bob