If you are looking to configure a domain to forward to another that you have hosted with us, then you will want to create a domain alias. Typically this is required when you have registered the same domain with a variety of TLDs (or suffixes). For example let's say you registered yourdomain.com and yourdomain.org and you have your hosting all set up and working with yourdomain.com. You want to have yourdomain.org bring the user to yourdomain.com automatically.
- Login to Plesk
- Navigate to the primary domain (yourdomain.com) by choosing Domains in the upper left corner, then yourdomain.com in the list
- Choose the Domain Alias button
- Add your secondary domain as an alias: yourdomain.org