Subdomains as stores names not supported. To do this, two steps required. The first step is to setup your own .htaccess in your domain
root folder to first skip your static subdomains then find none existing subdomains and redirect them to /app or the auction software folder
then this also should have .htaccess rules, then the softwre itself must have a feature to add unique store name as a valid sub domain name
which is not currently supported.
Of course if this feature is really important for you, we can do it as a custom work, just email us to discuss it.
Mewsoft Support www.mewsoft.com