So, I’ve been trying to figure out how to either move some foliage or spawn new into a sub-level that doesn’t contain a landscape but can’t seem to do it.
I’ve tried both procedural foliage and foliage mode.
I took a look at the Ark dev kit where I know the foliage is in different sub-levels but they seem to have a home made feature for it.
Is this something we can do somehow with the current version of the engine?
Cheers!
i know its old, but i ran 4 years later into the same issue and maybe other people will do.
create level + sublevel + landscape.
paint foliage.
paint SELECT foliage now you want to move to sublevel.
go to Levels Window, right click on your sub-level
and click “move selected foliage to sub-level”.
and a nice trick, if you just want to make a copy of you foliage and not move it. just move it from lets say sublevel a to b and do not save sub level a.
if you load next time your master level, both sub levels have the foliage inside.
i hope it works for you 
I am using world composition and i wanted to place foliage in persistent level.
I was trying to move it by selecting foliage and right click on it then clicking move to current location. (Never worked ) 
But then i read your answer, and move foliage on right clicking in level tab. IT WORKED… 
I was trying to move foliage to persistent for last one month.