Is the Datasmith scene still existent in your content folder, that was created during your import process? If so, then you would just drag this into your new level, and set it to coords 0:0:0. If not, then i guess, you have to reimport your models to get that Datasmith scene back. Within that Datasmith scene, all your imported objects are placed at the imported positions. It basically acts as an pivot point for all imported meshes/objects.