Is there a good resource to for learning about Exporting LOD with my FBX file?

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Is there a good resource to for learning about Exporting LOD with my FBX file?

I am using some Daz3D characters for some of my Unity Game Content. How do I create and export LOD levels. When I save a LOD in Decimeter it seems to just go to nowhere. It does not seem associated with the Character I export. I just learned Texture Atlas and that has reduced draw call for me in Unity. Now I need to Learn LOD.

I need to learn this for Daz3D 4,6 pro.

Thanks