Interior "Partial Walls"

[JulieK]

Hi,

For lack of a better term, I will ask about creating interior "partial walls." By that, I mean a wall that does not reach the ceiling of a room. Really, a partition of sorts. For example, I am designing a doorless shower that is bounded on one side by a curved wall section that reaches to about two feet from the ceiling.

And, somewhat related, I also would like to know how to insert a "window-like" opening in an interior wall. For example, an opening in the wall between a kitchen and the dining room in an open floor plan.

Thanks in advance for any help.

Julie