Add GameObject to lodgroup via script

Here you go Nmzikcs

LODGroup Lodgroup = gameObject.AddComponent();

That creates the LODGroup component where everything will live. Then fill up a LOD[] and pass it to SetLODS. Some rough code--

 LOD[] Lods = new LOD[numLODs];

 // Fill up Renderer[] arrays.  This is the list of drawables per LOD level
 Renderer[] allDrawablesInLod0 = new Renderer[numDrawables];
 allDrawablesInLod0[0] = (add the renderer of your desired object here)
 
 // Assign list to LOD 0.  Do the same for others
 Lods[0].renderers = allDrawablesInLod0;
 
 // Make it live!
 Lodgroup.SetLODS(Lods);
 Lodgroup.RecalculateBounds();