How can I animate multiple GameObjects with their respective animation tracks at once?

Hi there! I am learning about Unity Sequences, but after setting up my scene, I have an issue with trying to animate multiple objects at once. I have two characters in a boat, and a Virtual Camera. I would like to record keyframes for all of them at once. However, I cannot record on all tracks at the same time? How should I be setting this up? I have a sequence asset for each of the characters and the boat. I have a sequence asset for the cameras. The environment is also a sequence asset. The environment is on the top level sequence, and the cameras on the “Opening” group/sequence, and the characters and boat on the shot in the opening sequence. See attached screenshots.

If anyone could provide guidance on moving the boat and characters and camera together, and keyframing all of them at once, or on how I should be setting up the sequence, it would be appreciated.

Thanks