I have 3 videos of the same show but not all starting and finishing at the same time. But there is a part that the first and second video have together, and a part that the second and third  video have together that I could use as points to line them up, I just don't know how. Id like to make a video of all 3 together at once on the screen where the one that starts from the beginning would start, then the next two would come in at the points they start and have all 3 running in unison  so you can see the show from 3 different angles at the same time. How can I do this? Thanks