You can combine the objects in the scene into a group and create a separate timeline track for this group. This is convenient when there are several characters in the scene or when you need to set different keys and interpolation types for different parts of the body of one character.
Tracks also allow you to quickly highlight different objects or hide them.
One object cannot be located on several tracks simultaneously!
In scenes included with the program, different parts of the characters' bodies are already laid out on different tracks.