>
>I'm not sure how I would get that to work.
>
>Site.Add doesn't exist in intellisense.
>
>pvc.Add does, but it is looking for an object to be passed to it, so I'm not clear what I should pass to it.

It looks like you're not iterating over what I thought you were. You might be able to do this:

DirectoryEntry virtualDir = IISAdmin.Children.Find("Root", "IIsWebVirtualDir");
foreach (DirectoryEntry dirs in virtualDir.Children)
{
   Console.WriteLine(dirs.Path);
   // Change to real name of virtual directory you want to add a sub directory for
   if (dirs.Path == "IIS://localhost/W3SVC/1/IISHelp")
   {
      // dirs.Children.Add()
   }
}