Your sketches should always go into your "bag of tricks" so that you can reuse them (or portions of them). It's the orchestration and the musical context around it that will make a sketch appear completely different and unique once the final work is finished.
I'm a huge fan of storing and organizing my sketches because they allow me to compose very quickly and stay inspired.
If you don't do it already, please go through this video and take advantage of keeping your sketches.
coming soon ...
Author: Frank Herrlinger