How to use PowerShell to create websites and application pools in IIS. How to use PowerShell to create websites and application pools in IIS... A client of the company I work for wanted to quickly add 60 sub-domains to his website. But, the sub-domains had to be created as self contained IIS websites, and running in their own application pools. Luckily, the client wanted 60 consecutive sub-domain names. This made our task a bit easier, because we could easily script this in PowerShell