In a model sketch I only know one way to mark/unmark a dimension as designated for use on the drawing.  The Modify dimension popup has a little icon/button one can click if you want the dimension to be imported on the drawing or not.

How do I unmark a Driven dimension?  The Modify dimension popup is not accessible for Driven dimensions. Am I missing something in the property manager?

  Thanks, Brian (SolidWorks 2012)