You don't. But what you can do, if you have enough sub-branches to divide between day and night (ID 11 thru 17, and 18 is the directory), is to use, say, ID 11 thru 13 for day options, and 14 thru 17 for night options. You could use ID 18 in both, neither, or one or the other. Most people will only press an option if instructed. Make sense?

Otherwise, you will be using ID 1 Day for day, and ID 2 Night for night.

Menu branches, mailboxes, etc. are not active until they have a recording.

Also, I talked to one tech support person who said even if you are not using part of a menu branch (say you only use ID 2 at night, so you only have a night recording for ID 2), you still need to record a greeting in both day and night, or you may experience problems sometime in the future.