A parked domain points a new domain name to the same directory that your primary account points to.
How to setup a parked domain
If you registered your domain with someone besides YourHosting, make sure that the name servers are pointing to dns server that is ent on your welcome email. In your iisnet-networks cPanel, select 'Parked Domains' under the 'Domain' menu and enter the domain name you wish to park in the 'Create a New Parked Domain' form.