Is it possible to set a path for a domain, to where the homepage is saved ?

Hi,
Is it possible to set a path for a domain, to where the homepage is saved ?
Rt now when i try to set the path for a a domain of a multi-domain subscriber, each domain shows a path for httpdocs, but doesn't allow for setting an absolute server path, fr example to have multiple domains use the same absolute server path.

Regards,
Frank