We have a great enhancement to Manufactures that we have launched today: you can now add or remove to your batch recipes as much as you like per manufacture. This essentially means that you can use your Batch Recipe as your base recipe, and then configure variations and changes to it per batch you create.
If you add a one-off ingredient to a batch, this is accounted for in your material inventory history in exactly the same way as the materials in your batch recipe list. All Manufactures now also have a page showing which materials where used, so you can look back and see how your recipes have changed over time.
For more information, we have created a couple of handy help articles here:
Feel free to get in touch if you have any questions!