Hi Ruhann,
Currently, Test Hosts aren't related to Projects, so you cannot disable a Test Host only for a specific Project. I can recommend that you create a custom field for Projects: http://screencast.com/t/8WCS13rfkn and then create a filter for this field: http://screencast.com/t/jTLtFJL2iA.
The name of a Test Host cannot be changed, it is a computer name. But, you can create a custom field for a domain, too.
Adding a domain to the Test Host name and allowing project specific Test Hosts options look like good improvement ideas. You can post your ideas to the QAComplete Feature Requests topic: https://community.smartbear.com/t5/QAComplete-Feature-Requests/idb-p/QAComplete_Feature_Requests.
Anastasia
Customer Care Team
