Whoops!
My bad. I was referring to the camera center of rotation. When viewing the model and rotating it always rotates around the origin. I was wondering if there is a way to change the rotation of the camera so it will rotate around a selected edge or point.

Having this would make it easier to view the larger models because when I try to view something by moving the camera what I am trying to look at zooms off the edge of the screen.

I hope I was a little clearer. :)