LOD and SLOD

Hello guys! Recently I started to modify some drawable textures. As you know very well, there are several types of level of distance in GTA V: ILOD / LOD / SLOD. For the object you used to be seen from a great distance you need SLOD, but in GTA V some drawables that do not have SLOD, and this means that you can only see LOD, which means a medium distance. I want to know how to create SLOD if it doesn’t exist. I don’t know very well, I explained as I understood. Thank you <3