How to Spawn Actor Blueprints inside of an Actor Blueprint

I have an actor blueprint that consists of a cube.
I have another actor blueprint that consists of a section of a level.

I would like to integrate this cube as part of the level, rather than spawning the cube to its location relevant to the level.
i.e. I want this actor blueprint to be able to be spawned like a sphere or a cube or a box collision so I can place it inside my actor blueprint which acts as a section of a level.

Is this possible?

Add a Child Component inside your actor BP in Components section, and then set your other BP as the class of that child component.