What I’m really looking to do is have an Actor spawn or take control over a set of other Actors. It’s important that I can still select each individual “sub actor” after they have been grouped under a parent actor, to change properties on them. For this reason I can’t use Add ChildActorComponent or similar nodes in BP, because they are then treated as one object.
If I manually drag out Actors I can use Attach Actor to Actor node in BP to get the behavior I’m looking for. So to answer your question it’s any generic Actor type that you can manually drag to the level like you say, but I want to do it from code.
From a different discussion it seems I have to create an Editor plugin to do this.