How do i switch multiple actor for another one's ?

Hello everyone ! I’m a student in game design and i need some help for my games. I’m a little “new” to unreal and i would like to switch actors from another, let me explain :

  • My character, once he’s in a trigger box in the level and press “E” ( or another input ) multiple objects must be destroy/hidden, and at the same time, a few actors appears ( not specially in the same position from the old ones ).

It’s like the character travel in time with a input, and the level design changes. I can do it for one but it seem’s to complex and too “fat” in the blueprints with different objects.

Thanks ! Sorry for my english it’s not my first language !