I want to set up a class feature similar to draconic bloodline where you choose one option out of many which is used by class features you gain later on but doesn't immediately give you any bonuses, but the class feature options have a mandatory description box which shows up in the character cheet. So the description will be, essentially, the same fluff text to satsify the required box five times over again. Somehow, creating a subclass copy of draconic bloodline avoids this. Does anyone know how? I'm creating a Fighter subclass so I can't just use that copy.

Try basing off of the battle master, it has options.