Opening OBJ files in AutoCAD is a common need for those working with 3D modeling. To do this, you can follow these simple steps. First, open AutoCAD and go to the 'Insert' tab. Then, click on 'Import' and select the OBJ file from your computer. After the file is imported, you can make any necessary adjustments and start working with the model in AutoCAD. Keep in mind that AutoCAD may not support all the features of the OBJ file, so some modifications may be needed. Overall, importing OBJ files into AutoCAD is a straightforward process that allows you to work with 3D models seamlessly. Enjoy creating and editing your 3D designs with this useful feature!