[dannythefool]

I'm attaching a screenshot of the basic idea. My question was about the vertical arrows that connect the boxes to the timeline at the bottom. If I do actually connect them to the timeline, they will either point at its centre, or at some magnet. If I don't connect them to the timeline, when I move the boxes, the arrows will still point at the same location and the lines will no longer be directly vertical. What I want to achieve is have these arrows connected to both the box and the timeline, but in a way that they always go straight down to the point on the timeline directly below the box, regardless of where I move the box.