Creo Direct > Designing in the Creo Direct Environment > Working in Part Mode > Working with 3D Geometry > Creating Datum Geometry > To Preselect Datum References
  
To Preselect Datum References
Select any of the following combinations of references in the graphics window, and then click on the Live Toolbar to create a fully defined datum plane.
References
Result
Two coplanar edges or two axes (must be coplanar but not collinear)
Creates a datum plane that is defined through the references.
Three datum points or vertices (must not be collinear)
Creates a datum plane that is defined through each of the datum points or vertices.
A datum plane or planar surface and two datum points or vertices (points or vertices must not be collinear with the normal to the plane)
Creates a datum plane normal to plane through the selected points.
A datum point and an axis or straight edge or a curve (point must not be collinear with the axis or edge)
Creates a datum plane that is defined through the datum point and the axis or edge.