If you're looking to work with OBJ files in SketchUp for your 3D modeling and design projects, you'll be pleased to know that it's quite simple to do. Here's a step-by-step guide to help you open OBJ files in SketchUp:

1. Launch SketchUp: Open the SketchUp application on your computer to get started.

2. Navigate to 'File' Menu: Once SketchUp is open, go to the 'File' menu at the top of the screen.

3. Choose 'Import': From the 'File' menu, select 'Import' to open the file explorer window.

4. Select OBJ File: In the file explorer window, navigate to the location of your OBJ file and select it. Click 'Open' to import the OBJ file into SketchUp.

5. Adjust Settings: After importing the OBJ file, you may need to adjust the import settings to ensure the model is accurately translated into SketchUp. You can modify the units, scale, and other options as needed.

6. Work with the OBJ Model: Once the OBJ file is imported, you can start working with it in SketchUp. You can edit, modify, and enhance the model to fit your design project.

7. Export as SketchUp File: If you need to export the edited model from SketchUp, you can do so by going to the 'File' menu and selecting 'Export' to save the file in the desired format.

That's it! By following these steps, you can easily open OBJ files in SketchUp and incorporate them into your 3D modeling and design workflow. Whether you're working on architectural designs, product prototypes, or any other 3D project, SketchUp's ability to import and work with OBJ files provides you with a powerful tool for bringing your ideas to life.