what to do if trying to store breastmilk but have only got 1 oz of bm?

I'm trying to prepare to store bm for my baby but sometimes I only get a small amount of bm in 1 session, Should i store it separately in a storage bag? (I read that it is not ideal to combine bm in different pumping sessions) Then i'll try to pump again after few hrs but what if I got a small amount again of bm, can i store in a storage cup (to be stored in freezer) so atleast it is reusable?