Creo Reverse Engineering (Restyle) > Managing Domains in Restyle > To Assign a Domain to a Surface
  
To Assign a Domain to a Surface
1. Click Restyle > Assign Domain To Srf.
2. Select a domain to assign to the surface.
3. Select the surface. Restyle assigns the domain to the selected surface.
By assigning a domain to a surface, the facet vertices defined by the domain get added as reference points for the selected surface. Later this surface can be fit to these reference points.