Focusing on the relationship between parts and a whole:
* Chapters are to a book as scenes are to a play/movie.
* Verses are to a poem as scenes are to a play/movie.
* Bricks are to a building as scenes are to a play/movie.
* Notes are to a symphony as scenes are to a play/movie.
Focusing on the concept of building and unfolding:
* Steps are to a journey as scenes are to a play/movie.
* Stages are to a life as scenes are to a play/movie.
* Threads are to a tapestry as scenes are to a play/movie.
* Paint strokes are to a painting as scenes are to a play/movie.
Focusing on the individual components:
* Sentences are to a paragraph as scenes are to a play/movie.
* Ingredients are to a recipe as scenes are to a play/movie.
* Individual frames are to a film as scenes are to a play/movie.
* Pieces are to a puzzle as scenes are to a play/movie.
The best analogy depends on the specific context you're using it in.