When working with 3D modeling in Maya, enabling OBJ file format allows you to easily import and work with 3D models created in other software. Here's a step-by-step guide on how to enable OBJ in Maya:

1. Open Maya: Launch the Maya software on your computer to access the workspace.

2. Navigate to Preferences: Click on the 'Windows' menu at the top of the screen and select 'Settings/Preferences' followed by 'Preferences.'

3. Locate the Plug-in Manager: In the Preferences window, find and click on the 'Plug-in Manager' option. This will open a new window where you can manage different plug-ins for Maya.

4. Enable OBJ File Format: In the Plug-in Manager window, look for the 'objExport.mll' plug-in. You can use the search bar to easily find the plug-in. Once located, check the box next to 'Loaded' and 'Auto load' to enable the OBJ file format for import and export.

5. Restart Maya: After enabling the OBJ file format, it's important to restart Maya for the changes to take effect. Close the software and relaunch it to ensure that the OBJ file format is now available for use.

6. Import OBJ Files: With the OBJ file format enabled, you can now easily import OBJ files into your Maya projects. Simply go to 'File' > 'Import' and browse for the OBJ file you want to import. You can then use the imported 3D model in your Maya workspace for editing, animating, and rendering.

7. Export OBJ Files: In addition to importing OBJ files, enabling the OBJ file format allows you to export your Maya projects as OBJ files. This can be done by going to 'File' > 'Export Selection' and choosing the OBJ format from the list of file types.

By following these steps, you can enable OBJ in Maya and expand your 3D modeling capabilities by working with OBJ files. Whether you're collaborating with other artists using different software or simply want to take advantage of the versatility of OBJ files, enabling this file format in Maya is a useful skill for any 3D artist.