Creo Options Modeler > Creo Options Modeler > Top Down Design > Notebooks > Declaring Datums in a Notebook > To Undeclare Datums
  
To Undeclare Datums
1. Click File > Manage File > Declare. The DECLARE menu appears.
2. Click UnDecl Name.
3. Select the datum to be undeclared. Its original name replaces the name of the datum to which it was declared.