Parameter-based data can be passed as parameters to a configuration block, as follows:

    configuration FooBar
    {
      param([switch]$foo,$bar)
    
      if($foo){
        WindowsFeature InstallIIS
        {
          Name = "Web-Server"
        }
      }elseif($bar){ 
        WindowsFeature InstallHyperV
        {
          Name = "Microsoft-Hyper-V"
        }
      }
    }

    FooBar -Foo