Creo Interactive Surface Design (Style) > Surfaces > Editing Surfaces using the Surface Edit Tool > Editing Special Surface Types
  
Editing Special Surface Types
The following surface types have special consideration for the direct Surface Edit tool:
Surfaces with a degenerate edge—These are triangular and revolved surfaces. These surfaces may be selected for edit but the degenerate boundary is automatically protected from any edits, even if you move the degenerate point or align the degenerate boundary or one of the adjacent boundaries.
Current Trimmed Surface with base inside Style—Since the base surface is defined within the Style feature, the surface edit operation applies to the base surface. When you regenerate the geometry, the trim is automatically applied to the modified base surface.
Current Trimmed Surface with base outside Style—You can select a current trim for which the base surface is outside the current Style feature. However, the surface edit operation applies to a dependent copy of the trim base surface. You must manually edit the references of the trim to the resulting surface if necessary. You can do this by redefining the trim curve to be on the surface that you select for editing and replacing the quilt by surface edit in the trim redefinition.
External trim—The surface edit operation is applied to the dependent copy of the selected trim patch.
External base surfaces—The surface edit operation is applied to a dependent copy of the selected surface.
Composite surfaces created in another Style feature—The surface edit operation is applied to a dependent copy of the selected external patch.
Composite surfaces inside Style—The surface edit operation cannot be activated on a composite surface.