I want to put collar ties up high.

[pamlams]

I want a flat spot 2' or 4' wide that I would create with collar ties for the cathedral cieling.

[daydreamer]

"Soffits can be used in various ways to enhance the 3D model. The ability to have soffits automatically angle to fit the slope of the roof, combined with the ability to replicate groups of soffits at specified intervals offers unlimited possibilities. Polyline solids; framing members and locked roof trusses can also be used for this."

Look in the software Help. Enter Exposed Beams in the search field.

[Allen42ACJ]

Have your ceiling at that height and build the ceiling framing..
When you adjust the ceiling height,you should get dashed lines showing where it is.