Importing OBJ files with textures in Unity can be a straightforward process if you follow the right steps. Here's a step-by-step guide to help you achieve this:

1. Prepare your OBJ file and textures: Make sure your OBJ file and its associated textures are organized in a folder. Ensure that the file paths are correctly set for the textures to be properly linked to the OBJ file.

2. Import the OBJ file: In Unity, navigate to the project window and right-click to select 'Import New Asset'. Select your OBJ file and import it into the project.

3. Set up materials and textures: Once the OBJ file is imported, Unity will create a material for it. To apply the textures, create a new material by right-clicking in the project window and selecting 'Create > Material'. Then, in the inspector window, assign the textures to the material's respective slots.

4. Apply the material to the OBJ file: With the material created and the textures assigned, drag and drop the material onto the OBJ file in the scene view to apply it.

5. Adjust settings and lighting: Once the OBJ file is imported with textures applied, you may need to adjust the material's settings such as the shader, tiling, and offset to ensure the textures look correct. Additionally, consider the lighting in your scene to showcase the textures effectively.

6. Test and refine: Finally, test out the imported OBJ file in Unity to ensure that the textures are displaying as intended. Make any necessary refinements to the material and texture settings to achieve the desired look.

By following these steps, you can successfully import OBJ files with textures in Unity to enhance your 3D modeling projects. This process allows you to bring in detailed 3D models with their associated textures, opening up possibilities for creating more immersive and visually appealing scenes in your Unity projects.