About Parts and Documents
A part is an information object with an identification number, representing a physical component or assembly in a manufactured product.
Although a part can exist with or without a document, it is typically related to many document types, including CAD files.
A document is an object containing files in the application format. It has attributes and content that are relevant to the external application. A CAD Document is an object containing a CAD model that is a file or a set of files containing information in an application format. You can open a model in Creo and use the > command to create a CAD Document.
CAD Documents serve the following purpose:
• Store CAD-derived files (for example, 3D models, drawings, and viewable images).
• Can be related to parts so that CAD Documents can describe the associated parts.
• Can be related to other CAD Documents to allow the representation of the complex dependencies created and maintained by the authoring CAD system (for example, model-to-model and model-to-drawing relationships).
• Contain the primary content (for example, a 3D CAD model file) and the secondary content (for example, a viewable representation of the 3D CAD model file).
For more information on creating a part and creating a CAD Document using the Windchill user interface, click 
in the Windchill HTML user interface.
in the Windchill HTML user interface.