Yes, this is possible. What you need to do is to provide us the IP of your German server so that we can have it setup as the 'A' record of your subdomain.
ie: so when anyone pings the domain or browses it, it'd go to your German server.
Or you can have the sub-domain forwarded through .htaccess or through a simple PHP script. Please open up a ticket & this will be done within few mins for sure
