If you're looking to import OBJ files into AutoCAD for 3D modeling and conversion, follow these simple steps. First, ensure that you have the latest version of AutoCAD installed on your computer. Next, open AutoCAD and go to the 'Insert' tab on the ribbon. From the 'Insert' tab, select 'Import' and choose the OBJ file you wish to import. AutoCAD will prompt you to specify the insertion point, scale, and rotation for the OBJ file. Once you've set the parameters, click 'OK' to import the OBJ file into your AutoCAD drawing. Keep in mind that AutoCAD may need to perform a conversion process to open and import the OBJ file. Additionally, it's important to note that AutoCAD may not support all OBJ file features, so some adjustments to the model may be necessary after importing. With these simple steps, you can successfully import OBJ files into AutoCAD for seamless 3D modeling and conversion.