Creo Interactive Surface Design (Style) > Surfaces > Editing Surfaces using the Surface Edit Tool > Surface Alignment References
  
Surface Alignment References
Select a reference for the align operation according to the type of alignment:
Type
Reference
Align Tangent
Align Curvature
Edge, curve on surface, or neighboring surface
Align Position
Free curve, edge, or curve on surface
Align Normal Position
Neighboring surface or datum plane and curve or edge
Align Normal
Planar surface or datum plane