Projects allow you to consolidate multiple domains comprising a single web application so they can be scanned together.
This means that you can, for example, register two subdomains (e.g. login.example.com and mypage.example.com) as a single project and thus scan a web application spanning more than one domain.
Here are a few sample projects to give you an idea of how this works:
Project 1
login.example.com
Project 2
login.example.com (excluded from testing)
mypage.example.com
Project 3
login.example.com (excluded from testing)
mypage.example.com
cart.example.com
As you can see here, you can register the same domain name with more than one project, but each instance will also be counted for billing purposes unless it has been excluded from testing. (This means that you would be billed for four domains if you were to use the project structure above.)
VAddy PrivateNet does not provide support for projects.