Question regarding the Tutorial "Making a modular Building with UE4"

Hi,

I follow this tutorial - https://www.artstation.com/artwork/Kq5xy - but since I’m absolutely new to Blueprints, I’m having trouble figuring out what parameters to change for the Right Side when duplicating the left one. I asked the author of the tutorial but didn’t get an answer, so I’m asking to you for some help, thanks !