Have you tried using a node DestroyActor?
If I correctly understood the essence of your question, you need to activate the node DestroyActor by event. Event you can get through the trigger volume or any other way you like…
Design features will depend on whether you do it in a separate blueprints or LevelBlueprint.
You will also be needs some knowledge about [Blueprint Interface][2] and [Blueprint Communications][3]
As said LimasseFive, you must use Blueprint Interfaces. How To Use Blueprint Communications you can see hear.
Examine the above information. If you do not get to realize that you wanted to do, I will try to explain in more detail how this works.