1. First, open the CAD software, create a new CAD document and import your logo file. Supported file formats include vector format files such as EPS, AI and PDF. Select the Insert option in the menu, select RasterImageReference, browse to your logo file and open it.

2. Secondly, edit and modify the logo in CAD software. You can use the drawing tools in CAD software to trim, modify or redesign the logo. You can convert it into a 3D model, render it more finely, and add other functions and components.

3. After the last operation, save your CAD file. Select the "File" option in the menu, select the "Save As" option, select a CAD file format (such as DWG, DXF), name your file and save it.