Hello grievousOrder66,
What Program did you use to Model your assets?
I use Maya, I can Select the highest LOD to the lowest group them through LOD setting and when i export in FBX it automatically set them up
You will need to open up your base mesh, Under the search bar type LOD there should be a + button referring to LOD click that how many times you have LOD’S then Link the Mesh’s from your Content browser to your Static Mesh Viewer.
There is no other way that i know of to simply Select a bunch of meshes and Generate collision unless you check that box generate collision on import. However we both know its not complex.
you can read more about it here