Hi,
There are numerous ways to do that. Samba offcourse, transfer files via telnet or try Pronet.
I havent tested pronet with morphos so I dont know if it works or not. But back in the days my friend got 2 Amigas connected and it worked like a dream. With Pronet you can mount the other machines hardisks, cdroms etc. Just like samba does. You can find Pronet from aminet:
ProNET34.lha