When working on 3D modeling projects in Fusion 360, you may want to import external OBJ files to incorporate into your designs. Here's a step-by-step guide on how to load an OBJ in Fusion 360:

1. Open Fusion 360: Launch Fusion 360 on your computer and navigate to the workspace where you want to import the OBJ file.

2. Insert OBJ File: Click on the 'Insert' tab on the top menu and select 'Insert Mesh' from the dropdown menu.

3. Locate OBJ File: In the 'Insert Mesh' dialog box, navigate to the location on your computer where the OBJ file is saved and select it.

4. Adjust Settings: After selecting the OBJ file, you can adjust the import settings such as scale, position, and orientation before importing it into your workspace.

5. Import OBJ File: Once you've adjusted the settings, click 'OK' to import the OBJ file into your Fusion 360 workspace. The OBJ file will now be loaded and visible in your design environment.

6. Edit and Modify: After loading the OBJ file, you can edit and modify its properties as needed to fit into your overall design. You can use Fusion 360's various tools to manipulate the mesh, apply textures, and perform other modifications.

7. Save and Export: Once you've integrated the OBJ file into your design and made any necessary adjustments, be sure to save your work. You can also export the completed design, including the OBJ file, for use in other applications or for 3D printing.

By following these simple steps, you can easily load an OBJ file into Fusion 360 and incorporate it into your 3D modeling projects. Whether you're working on product designs, architectural models, or artistic sculptures, Fusion 360 provides a seamless way to import and modify OBJ files to bring your ideas to life.