You can have multiple services on the same .onion address. You can forward each port to a different service.
HiddenServicePort 80 127.0.0.1:80
HiddenServicePort 8000 127.0.0.1:8000
HiddenServicePort 81 192.168.0.102:80
This (in your
torrc) would expose 3 services on 1 .onion address. The first 2 live on the same host as the Tor relay. The 3rd lives on another host in the local network.
Edit to add: See also here --> https://www.torproject.org/docs/tor-hidden-service.html.en#threesection three of the site Configuring Hidden Services.