In our facility we have multiple products where the manufacturing process is identical, but the product characteristics vary greatly (recipe, shelf life, allergens, etc). It would be great if the "Ingredients, Composition & Recipe" section in the HACCP module could be linked to each Product Batching Program that the HACCP plan includes. It would provide a ton of detail for the Product Description without having to duplicate the work.
From the HACCP Plan you can click Actions > Add Related Record > Link URL / Other and associate your HACCP Plan with your Products and/or Batching Programs. Its not exactly where you wanted it but perhaps close enough.