The URL you have chosen already exists in the site structure. Would you like to add the existing navigation structure for this URL?

The URL you have chosen to add to the current site diagram already exists in another site diagram.

• If you want to add the existing navigation structure for the URL as it appears in another site diagram, choose Yes.
  
  
• If you want to create a new instance of the URL without the existing navigation structure, choose No.

For more information, see Adding Pages to a Site Diagram and Troubleshooting.