Color problem

Hello everyone!

It’s my first time on the forum, I hope my post is in the good topic.

I’m working on my very first map in ureal engine. I would like to have the same color beetween the walls and the ceiling.

In 3ds max with vray I use an override material to fix the probelm. I don’t know how to do that in ue4

Here a picture to show you my problem:

I hope my english is clear enough!

Thanks a lot!

Best

William