Creo Simulate > Reference Links > Factors Determining the Selection of Entities
  
Factors Determining the Selection of Entities
The type of entity you can select on your model depends on the model type and the type of material orientation.
Model Type
Material Orientation Type
Selectable Entities
3D
3D
Part (part mode)
Parts (assembly mode)
3D
2D
Surfaces
2D (Any)
2D
Surfaces
Return to Material Orientations Dialog Box.