[Kaitiaki]

To expand on Dawg's answer, yes, multiple feeder leagues can feed one major league, and in many situations that's what you'd want to do: a single feeder league of the same size as the major league doesn't produce enough players per year to "completely" feed the draft: OOTP can fill in the gaps with generated players, the same way drafts worked in the past, or you can use more than one (or two, or whatever) feeder leagues to have a draft that is entirely "real".

- Kai