The best approach is to create the subdomain as a full domain in the Control Panel. This will provide a full directory structure to your subdomain, including the symfony_projects directory.
To host a symfony app in a subdomain follow these steps:
- add a new domain in the control panel with the subdomain as domain name, ie. sub.example.com
- upload your symfony project into the symfony_projects directory of your subdomain FTP account
- go to Maestro and setup the web server to use your symfony project web directory as document root.
