Sorr for not being clear - rearranging and spawning pre-made meshes to create new objects (and within maps rather than blueprints for the spawning of things like walls, doors, floors, ceilings. Not necessarily programmatically at game-time (though being able to build lighting at game time for random level generation would be nice and seems loosely related, just haven’t run into needing that yet so I haven’t bothered to search on it) - mainly for generation of blueprints as I’ve got several that are highly repetitive with 100’s of static meshes I’d rather not place by hand if it can be done in code or blueprints, but spawning instances of instanced static meshes doesn’t work that well since you can’t set the Mobility to Static and incur huge hits to FPS as a result of being unable to build lighting.
Basically just spawning of static meshes dynamically before the engine does things like building of lighting.