How to modify, upgrade buildings or props in runtime?

Hello!

I tried to google it but can not find anything about this. The player will start with a destroyed base which he can repair later in the game and I want to change its look.
Example: The room full of rubbish, then the player click on the upgrade button and all the rubbish is gone and a new bed will appear in the room. I just need help with a blueprint to how to change, removes the rubbish and add new props to the world and change the floor and wall material in the building in runtime.
Thank You

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