[UNiagaraHierarchyItemBase](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\UNiagaraHierarchyItemBase) * AddChild ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UNiagaraHierarchyItemBase](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\UNiagaraHierarchyItemBase) > NewChildClass, [FNiagaraHierarchyIdentity](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\FNiagaraHierarchyIdentity) ChildIdentity )