these lesser-known events

[6555]

these commands have explanation of events? because I saw that the majority has no description ..
and how to use these events?

[LastingDawn]

As memory serves me right they're mainly used in story progression capacity. I can't say when multiplying or dividing comes into play, but I know that the game makes ample use of the Add/Sub commands when it comes to entries in the Brave Story, giving a Treasure (Zodiac Stone for instance) , adding the new storyline point, removing Treasure, etc.