The payment request is settled in the account (bank or Paypal) pointed in the invoice. This means that splitting royalties from the platform is not an available feature yet, as the payment is being liquidated in an only account.
To divide the royalties, an only payment request must be done according to the "Royalties Payment Process" and, afterwards, split them manually between the sharers.
The amount generated by each track, release or label of a user can be checked in the section "Sales", as well as the dates and channels from where this information comes. That way you can distribute the amount corresponding to each participant.