keepout and part mass

Thanks Ken. I was hoping there was a way to do this within the board outline part . A lot of keepouts rely on the PCB outline and holes or other geometry as a references. In addition, many of our keepouts have complex geometry. Having to create and assemble separate components representing these geometries into an assembly adds steps and complexity to the workflow. Of course zero height keepouts can be represented by a sketch within the part. However, I need  to represent keepouts with a height restriction other than zero while not affecting the mass properties of the PCB itself.