What are you trying to achieve?
You want to split the House actor (composed by a bunch of static mesh components), but you want to do that on gameplay, right?
You need each part of the house to be an independent actor?
you actually can spawn actors in the scene and you can ADD static mesh components to actors…
you can make a HOUSE_PART_BP actor with a single empty static mesh inside and from the house BP you can get all your static mesh components (root–>get all childs?) and then a for loop and for each static mesh you spawn a housePartBP actor and copy the mesh of the static mesh component of the loop into the static mesh component of the spawned actor… you follow me?