Until you're confident in what you are doing, I would keep the leftover as a back-up. You will soon see that you won't need to. Keep your mother starter refreshed at the recommended ratio, and do the levain final build as per the recipe formula. In other words, keep them separate.
Until you're confident in what you are doing, I would keep the leftover as a back-up. You will soon see that you won't need to. Keep your mother starter refreshed at the recommended ratio, and do the levain final build as per the recipe formula. In other words, keep them separate.
Cheers,
Gavin.