Ingredients and sub-recipes are the same underlying record with one flag: Show On Sub Ingredients decides whether it appears on Kitchen > Ingredients (raw items you buy) or Kitchen > Sub-Recipes (things your kitchen makes and then uses inside meals, like a sauce or a cooked protein). Opening an ingredient's edit page shows a Convert to Subrecipe link (and a sub-recipe shows Convert to Ingredient) - this link only appears on a Seed, Starter, Base, Pro or Enterprise plan; clicking it flips the flag and redirects you to the matching list. Converting does not change the item's name, price, macros or where it is already used on meals - only which list and picker it shows up in going forward.