Hi to reverybody.I'm new at this place.Actually, i've seen the Guide, Part 3, in this part, it shows a dialog box for cd key.I s it necessary to fill it.If it is not, then a lot of time is saved.Thanks.

Keep it up. :hello:

If you choose to enable the "unattended" install, it is to save time at install. If you want to save time at cd build but enter the key manually at install, then you don't need to use unattended. Or leave the cd key blank. Your question sounds a bit odd.
By the way, the key can be copy/pasted in one go.