OK, found it in HTML source code. No idea how come this help is not a part of actual page.
To anyone looking for this:

To add from list, one per line, in format:
computername,00:11:22:33:44:55

It seems I can not find the correct way to use the Computer List bulk add under Computers/Create Image Only.

I can add computers for deployment one by one using Single Computer name and MAC lines.
Now I would like to run a batch of 10 computers and adding them in 1 list could save time.
What is the correct way to fill the box so I could use the option Create Computer From List?
Thanks.