Raising Trusses

[ChiefZachary]

Hi all,

 

Hope all is well. Just a general understanding of what i am trying to accomplish with what I am working on:

 

I have 14' sidewalls currently on a 6/12 pitch. The ceiling height is set at 120", but the client wants attic space and/or may add additional rooms upstairs down the road. I would like for my trusses to generate as if there were a second floor. (I've tried that still could not get it to work.) The trusses are currently sitting on top of the ceiling of my first floor (bottom chord). How do I accomplish this?

 

Basically I want an empty space above my first floor ceiling. 

 

Thanks in advance.