My issue is most of the many many props and furniure items were added at frame 30 so its all the "stuff" I am trying to save. So now that the room is built, the lighting is set and the models are posed I want to save frame 30 as a launching point for the project.

As for deleting frames AFTER what you want to save that is simple. Lets say you want to save frames 1-20 of 30. Just go to frame 20 and in the "frame of counter" enter 20 instead of 30. Poser will notify you you are deleting frames and you are set.