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I keep my starters in the fridge and when I want to use them I pull them out and refresh them according to recipes. In this case, I may want to refresh my white wheat starter with spelt or wholemeal so what I do is take out however much I need and I refresh it according to the instructions. Then, so I don't run out of starter, I weigh some or all of the remaining starter depending on how much I have. I add the same amount of flour and the same amount of water and give it a good stir. I cover it and let it refresh alongside the starter I will be using. The next day, I put it back into the fridge (in the vat with the rest of it, if I only refreshed a portion) for another day.