Hello. I have recently started making a mod that involves manipulating the shape and terrain of the fallout new Vegas world, but not creating a new worldspace. I understand that generating LOD is usually used when you need an LOD for a new worldspace, however, that is not the case. I want an LOD similar to my terrain, however, I don't want to re-generate the entire LOD of the New Vegas world. So if anyone knows how to generate LOD cell-by-cell, or something along those lines, please tell me. Thanks.

Generating LOD for the vanilla worldspaces is an absolutely nightmare, and isn't really a feasible thing to do unfortunately.