Is there a way to automatically create and fill sublevels?

I want to use level streaming and i need to put 2 or 3 actors in each of many sublevels, do i have to do this by hand or there is a way to automate this that isn’t a paid plugin?

Can you say a bit more about what you want to do?

If you don’t have much in each sublevel, it’s quite a lot of hassle for something you could do in one level.

I’m experimenting to create planets or at least something similiar with my limited knowledge. The last thing that came to my mind was to create a chunks of a planet in blender and put each in its own sublevel with a proper trigger volume to load and unload the corresponding chunk, but i don’t have a powerful machine so i end up needing many chunks to not use too much memory.
edit: replace “put one” for “put each”