Migrate levels between projects?

Hello everyone, I’m having this doubt :

1 - I have one huge landscape level with foliage. It uses a Movable Light Source so I dont have to Build Lighting every time I change an asset.

2 - Now I want to create a very detailed house for putting inside that landscape. I created another level inside the same project. It uses Stationary Light Source and in World Settings I have different values in Lightmass Settings. I created a new level because doing the whole building inside the landscape took forever to build the light.

So, the question is, how can I merge the house inside the landscape? I want everything to have the same position, textures and so on.

  • Can I migrate the house level keeping my built light? Is it possible? Do I have to build it all over again?
  • What about my Lightmass Settings? If I use those inside my landscape level, build times increase up to 10+ hours.
  • Would it be better to create another project instead of another level for migrating? Is there any “correct or better” way to do this?

Thank you in advance, I hope someone will clear these things for me as I don’t really get them.

wondering the same