In Autodesk Inventor 2013, importing OBJ files can significantly expand your 3D modeling capabilities. To import an OBJ file into Inventor 2013, follow these steps:

1. Open Autodesk Inventor 2013 and create a new or open an existing project.

2. Go to the 'File' menu and select 'Open' to browse for the OBJ file you want to import.

3. In the file browser window, select the OBJ file and click 'Open' to import it into your project.

4. Once the OBJ file is imported, you can now work with it within your 3D modeling environment. You can manipulate, edit, and incorporate the OBJ file into your existing project as needed.

5. To further enhance the imported OBJ file, you can use the various modeling and editing tools in Autodesk Inventor 2013 to refine and customize the object to fit your design requirements.

By following these steps, you can seamlessly import OBJ files into Autodesk Inventor 2013 and leverage its powerful 3D modeling capabilities to enhance your design projects. With this capability, you can work with a wider range of file formats and collaborate with others using different software, opening up new possibilities for your 3D modeling projects.