Export FCPXML for Multicam | Final Cut Pro X
How To Edit Multicam With Final Cut Pro And TimeBolt
How To Edit Multi-file with FCPXML Multicam
Example #1 Video File + Audio File
This example assumes that the audio file is the higher quality audio recording. This is why it's used in TimeBolt to create the cuts. The video is then added as an angle in the multicam clip and synced with the audio file.
If you have more than one video - you would add them as another angle, copy the clips to another track and switch the copied clip to the new angle.
Example #2 Two Video Files (Bottom + Overlay)
In this example, there are two video file with one of them being used to make the cuts.