Additional Capabilities > Service Information Management > Configuration Guide > Service BOM and Parts Lists for an Existing Product
  
Service BOM and Parts Lists for an Existing Product
If you installed Windchill Service Parts, you can add a Service Bill of Materials (sBOM) and Parts Lists to an existing product context.
You need to add the Parts Author role and the Publications Manager role to the product context Team to enable the ability to create a Parts List.
Refer to Adding Service Roles to a Product for instructions.