Persistent Level migration

I started building my world on the persistent level and am now wanting to add adjacent levels via world composition. However, I can’t do that with the persistent level. Is there a way I can migrate everything to a sub-level? I know I can export/import my height map and even copy all the assets over but I can’t copy the foliage (from the foliage tool) or the terrain painting.

I copied the persistent level in Windows Explorer and made a copy of it then renamed it. I loaded that copy as a sub-level but when I delete the items on the persistent level and try to reload the sub-level, UE crashes.

Is there a better way to go about doing this? I’d really hate to repaint the entire level again.

Thanks!

Open the level in UE4, save it with a different file name.

Open that new level up and disable all the level streaming options.

Then open the original, and delete any objects you don’t want in the persistent world.

I got the maps to straighten out like you suggested but now it looks like the below pic in World Composition:

I wouldn’t read too much into what the World Composition tool looks like. Its a bit hit and miss. For me sometimes it shows my terrain and statics, sometimes its just black. So long as the level works fine and you are able to select the levels in World Composition you are fine.

In case anyone cares, I believe the issue was that the map still included the sky sphere and since it wasn’t the persistent map anymore, it showed the sky sphere in WC. All I had to do was move the sky sphere to the new persistent level (where it should be) and WC went back to normal. That explains the giant white circle (sphere).

Additionally, the way to fix this entire issue would’ve been to simply go to Edit > Project Settings > Maps & Modes and set the Editor Startup Map to the one you want as the persistent map.