Get List of Citrix machines, identify the Hostname and Machine Catalog...

… then sort by the Delivery Group

Get-BrokerMachine -MaxRecordCount 1000 | ft MachineName, HostedMachineName, CatalogName -GroupBy DesktopGroupName

Another approach would be to create a grid to work with:

Get-BrokerMachine -MaxRecordCount 1000 | select DesktopGroupName, MachineName, HostedMachineName, CatalogName | Out-GridView