Remove other levels that use the same geometry

Hi all,

Maybe there is a simple solution for this, but I don’t want to mess much with the files imported with Datasmith to avoid breaking something.

I have several levels that all use the same geometry I imported using Datasmith. I actually imported it to the first level, then saved the level under a different name to make some modifications to the scene, then to another, etc. The thing is that what I want to do is to remove those first levels that use the same files to clean up the project. But it seems that the geometry in the last level I have made from the previous ones is referenced in them. I didn’t wanted to delete those first leves for fear of breaking up the project. Is there any solution to this or I can just delete them without problems?

Apologies if the question is a bit confusing and many thanks