how to create subdomain run *not* from subfolder of TLD?

Hi,

I want to create a subdomain, but want it to reside on the same directory level as normal domains, not below the directory structure of the top domain. How would I do that from within Plesk? When I try to create a new subscription, www. is already put as hostname, and when I try to create a subdomain from the control panel of the top domain, I can't choose a directory path above the one of the top domain...