Deploying apps under the same domain

Hello, I have a railway app already configured with a domain, and I want to deploy another app to the same domain, is it possible to have it as a folder of the domain or does it need to be a sub domain?

How would I set this up? Thank you

the main domain app is a next js deployment, so I guess this would cause routing problems? Probably best to setup using a subdomain?

yes

alright, thank you