Trusses on second floor

[CoolHandLuke]

I have already built the second floor is there a way to build it using floor trusses as opposed to using 11 7/8 and osb?

I don't want to rebuild the second floor from the start. 

[robdyck]

Do you mean that you have already built the 2nd floor framing? If yes, there really are 2 ways.

1. Change the floor structure type for the 2nd floor level and then rebuild the floor framing for just that floor using the Build Framing Tool
2. Delete all the 2nd floor joists and redraw with the floor truss tool. It's not as difficult as it sounds if you make use of the transform / replicate tool, or the Multiple Copy tool.

What you can't do is 'change' a joist into a truss.