When you configure a part for CNC, you will have the option of uploading a 2D drawing.
If you would like to call out critical features, custom tolerances, tapped holes, press-fits, interfacing components, surface finishes, etc., upload a PDF engineering drawing to communicate those details.
Check out How to Make an Engineering Drawing.
To save you machining costs and time on your part, be sure to exclude any unnecessary call outs. Take a look at Engineering Drawing Best Practices.
Feel free to communicate any other details with us in the chat box!