Hi Cory,
PreOS client works slightly different to the Windows client, and it does not use the computer name.
But what you can do is to run start ngctw32 with a folder name. In this case, if the machine is not already in Console, it will put in to the folder instead of default. If the folder does not exist in Console machine group, it will be created. In WinPE, ngctw32 already run with a parameter -console to display the output. If you run it with
ngctw32.exe -console "Test1"
Machine will be added to the Test1 folder instead of default.
Hope this helps.
Krish