Add laser in AutoCAD


My name is Lucas, new in the Snapmaker Community, usually I learn alone but this time, I’m stuck.
Here is the problematic : I need to engrave some area appart, because there is some different depth. But in Luban I think it’s impossible. In Lightburn my Autocad file (.dxf) is vectorized the wrong way, it’s chaotic. So my last solution is to use AutoCAD to engrave, I’ve seen some guy who can add a laser as a plotter in AutoCAD, but can’t find how to do it. If someone as an idea, I will be greatful !
I’ve tried to group everything useful in one image :

Sorry for the approximate English, I hope it will be understandable.
Thank you,