Creating Datums in 3DEXPERIENCE sets up the creation of the Datum Reference Frame for tolerances, which details the position and references of the part.
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Procedure:
1.Open a part to create GD&T
2.Switch apps to the Functional Tolerance & Annotation (FT&A) workbench
3.Start the Tolerance Advisor 
4.Select a surface for datum A.
5.Select the datum icon in the dialog to create datum A.
