How to add levels in variant set manager ?

Hi here,

For my work and espacially for a huge convention, i need to build a car configurator but i’m just a mechanical designer…

I want to add level such as “automotive bridge scene” and “automotive winter scene” to my variant manager but i don’t know to do that…
If possible, using “switch actor”.

I tried to merge levels and use “switch actor” but the result it’s very bad… Too bright, meshes missing…

How can i do that ?

Thank you very much for your answer…

Cypia