What's New: Creo Parametric 4.0 > Assembly Design > Parameter Restrictions
  
Parameter Restrictions
Restricting parameter values is easier.
User Interface Location: Click Model > Parameters.
Release: Creo Parametric 4.0
Benefits and Description
From the Parameter dialog box, you can restrict parameter values. Click the check box in the Restricted column and type a range or provide a list of values. Click Properties to open the Parameter Properties dialog box. In the Definition tab you can make changes under Restricted Options.