add project      --name=yah --long_name="YETI @ home"

add platform     --name=c64 [ --user_friendly_name="Commodore 64" ]

add core_version --platform=c64 --version_num=717
                    --exec_file=/path/to/boinc_7.17_c64
                    [--message="Message"] [--message_priority="Priority"]

add app          --name=YetiApp [--min_version=716]

add app_version  --app=YetiApp --platform=c64 --version_num=717
                    --exec_file=/path/to/yeti_7.17_c64
                      [--signature_file=/path/to/sig_file]
                    [--exec_file=/path/to/more_bins
                      [--signature_file=/tmp/sig_file2]] ...

add user         --name="Carl Sagan" --email_addr="carl.sagan@example.com"
                    --authenticator="deadbeef"
                    [--country=Estonia --postal_code=94703
                     --global_prefs_file=/path/to/prefs.xml]

Typically you will only add platforms and apps, and only at the inception of the project. A project is created with make_project. Core_version and app_version are automatically added by the update_versions tool. Users are usually created through the Web interface.