If your using fabrication within CAD then a wrapped object would allow this.  Just be aware than you would need to build a CAD object for each size.  Not the best way but would do what you want.  If you're in Revit these will not be supported and the best method is what craig mentioned.  This is also how we manage it.

Nathan Chapman
Production Manager at General Heating and Air Conditioning

Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author

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