Reallocating credits
If an account has unapplied credits, you can reallocate those credits to unpaid bills for the account. Reallocating credits is similar to the process of reconciling an account, but when you reallocate credits you can select the bills that you want to apply the credits to and the amount of each credit that you want to reallocate. Unapplied credits can also be refunded, manually applied to unpaid charges, or transferred to another account.
See Applying credits, Reconciling an account, Refunding credits and Transferring credits.