How to add levels in open world?
Hey there @janicewhtt! So this is a bit of a weirdness when it comes to world partitions. World partitions were designed so that you didn’t have to make sublevels (or in your case import sublevels). However you can still import your levels normally, but adding them as a sub level to an existing level is unfortunately not possible outright due to the nature of world partitions and you cannot disable world partitioning on levels once it’d be activated. This is about the extent of my knowledge on world partitioning, so the documentation may assist a bit better than I could with your specific use case. However don’t let that deter you from asking more questions here! I hope this helps!
So for world partitioned levels you’ll need to import your map like normal into your project, then turn it into an instanced level to be used with the world partitioning system. I’ve been using the old level streaming system myself so I have minimal experience with world partitioning, but the documentation here explains it a bit Level Instancing in Unreal Engine | Unreal Engine 5.0 Documentation Hope it helps!