It seems silly to force us to manually track items in a stockpile to make sure an unused part gets used on a car that’s no longer produced.
The game should give a few more options to clear stockpiles:
- Sell off unused inventory to outside companies like parts distributors (export).
- Throw away unused inventory.
I noticed that even when I disable the production of a unit like regular lights vs LED lights, the manufacturing unit still produces items that are not applied to cars currently in production. There needs to be some global administrative function that informs the production to stop making parts no longer in demand in the factory. This is not a game feature, it is a bug.