Use the Parametric Definition dialog to enter parametric definitions for various variables, for example, the depth of a hole or the pitch of a thread when using PartMaker's Family of Parts Programming feature.
To display the Parametric Definition dialog, click the Parametric 
button that is displayed alongside a variable on the Profile Group Parameters or Hole Group Parameters dialog:
<Name of Variable> — Enter the formula for the variable that you are defining parametrically.