If a real user accessing the FTP server is a member of a guest group defined in /etc/group, they will be permitted access to a different FTP home directory from that available to anonymous FTP users. All users in the same guest group share an FTP home directory for access to the FTP server.
To define a guest group using the FTP Server Manager:
Guest groups.
Add.
See Administering users and groups for information on how to set up user accounts and groups.