How can I make nested foliage?

I am using 3ds max with Forest Pack, and I use one branch to make a bush to scatter around. One “foliage” object to scatter in another “foliage” object. I use Datasmith and it translates the first scatter object, but not the second.

How can I get my nested scatter objects working in Unreal?

For foliage, it is massive amounts of polygon saving using this method and I really want this to work.
Any workaround is also appreciated.