Here’s how you can convert your World Composition map into a World Partition map in Unreal Engine 5. This tutorial helps you bring larger World Composition maps from the older Unreal Engine 4 into Unreal Engine 5.
https://dev.epicgames.com/community/learning/tutorials/9qzn/unreal-engine-procedural-content-generation-spawning-foliage-with-a-spline