Visio 2010 - Edit Master Shape (HP Common - Rack U Ruler)

[William]

I have a stencil that is of a ruler based on 50 rack units (50U).  I dragged the stencil to my favorites and then EDITED the master shape.  I then changed the ruler to include 53U.  I also went to define shape data and added units to my variable list...51;52;53 but when I change the shape ruler to include 48U I show rack units 53,52,51>>gap>48,47,etc. - In short it shows my newly defined rack units instead of hiding them.  How can I control/hide the rack units I defined?