Replenishing a starter
I have a question related to using a certain amount of starter and then refeeding the starter. Let's say hypothetically I have 4 cups of starter(which is a lot I know) and my recipes calls for 1 cup of starter. In order to feed the starter can I use the 1 cup of starter and then feed it with 1 cup of equal parts water and flower? Or would it be a good idea to use the 1 cup and throw another cup away, then feed it with 2 cups of equal parts flower and water?