When you create a new event, simply hit "New Page" and it will create a new tab. I don't know why they didn't just put "New Tab". Maybe someone in the english translation department got lazy? Well, whatever the case may be, once you create taht tab, you will see some tabs (Obviously) right under the "New Page" and "Copy Page" buttons etc. Click on the new tab. It's completly blank. This feature is good for alternate events. It's very good for your quest journal becuase i can make the event that starts your quests turn on a variable, and when that variable activates, i talk to the NPC (Person) that i specify, and get a completely different responce. I might have to make a video becuase i'm not quite sure that i'm being quite clear. Again, im'a noob. However i'm sure of the tab things one becuase i've used them, two becuase in teh events pallatte(The one that opens when you hit "Insert") if look to the near botton you will see a bunch of buttons, and few of them pertaining to tabs. That's how i know they're called tabs, becuase i messed around with them a lot. It turns out that you can make a tab jump to another tab if the conditions aren't right. This feature is very good becuase it makes event's less messy. I will still follow up with some images just in case this isn't enough (I have a feeling.)
Thanks!