How do I quickly make a lot of events into sub-events?

Hello! I have a lot of events on my event sheet, but I've just realised that they need to be sub-events of one larger, controlling event which I have just created. What is the easiest and quickest way to make these events into sub-events of the new, controlling event?

Sorry about the number of 'events' in this post!

Happens to me all the time. Unfortunately to my knowledge, the only quick solution is the ctrl button and selecting all the main events and moving them all together.

Thanks! Luckily it was only about thirty events so it didn't take very long. The problem with the drag-and-drop event sheet interface is that it is hard to tell where events will be put if you do drop them - sometimes it just picks up the conditions and drops them into another event!

Actually it is very easy to tell it where to go. When you are dragging those events, if you want to put it as a sub event, drag it into the grey rectangular area right below the event codes. It will know you want to make it a sub event.