How to create hallways?

A while ago I was developing a game, but because I don’t have any experience with 3D software I tried to create my hallways in UE4.

My question is, how can you create a hallway?

I mean, the hallway itself I can do, but the corners, how can you do those? I would appreciate it if somebody explains to me how they did it in their game.

Use BSP brushes (Under geometry in the modes panel) and place them for your walls/floors/roofs. for a corner just rotate a BSP brush by 90 degrees and place it so that the corners line up.

The problem I have is that my hallways are cylinder shaped, so how would I go about cornering one of those?

You can’t create actual geometry in Unreal, they give you basic shapes to use (cube, cyllinder, etc) but you need another program to create anything more complex than that.

make two cylinders that fill the insides of the hallways, set them to subtractive, and push them in to a bsp box that covers the corner.

I figured it out, thanks for the help.