To make a subdomain sub.yourdomain.com, just create subdirectories /sub and /sub/html, and place files related to your subdomain into /sub/html. You can create /sub/cgi-bin and use it as CGI directory...
The subdirectory /logs (read-only) contains your raw access log. It refreshes hourly, and rotates daily with maximum history one month...
The subdirectory /stats (read-only) contains your web statistics based on the above log. These stats are being re-generated at least once a day.