1. Create a folder via FTP in the 
FTP directory "www/data".

2. Log in to the customer center 
and select your contract.

3. Click on the menu point
"Subdomains".

4. Set up your further domain names here.

As folder you declare "www/data/VERZEICHNIS". Whereas DIRECTORY stands for the folder created via FTP.

In the normal case 2 "subdomains" are to be created: first the pure domain.tld and then the conventional www subdomain: www.domain.tld. 

Note that changes aren't implemented instantly but can take up to 24 hours until our web servers have applied them.