Corporate Billing Portal: Granular Payments

The old Jive billing portal provided more granular capability for paying invoices. 

The new billing portal only allows for the payment of the current balance outstanding, whatever that is.  Under ordinary circumstances that is fine.  However, if for some reason, I have more than one invoice to pay, I want to be able to make a separate payment for each invoice to ease my internal reconciliation process.  I want to post a payment to specific invoices. 

In addition, there could be a scenario where I may only want to pay part of an invoice (eg, an open dispute on a charge).  Please restore the ability to make a partial payment against an outstanding balance. 

I'm not sure why every time you move us to the new GoTo user interface, you take functionality away.  You've done with the PBX too. 

It's enough to drive me away from the product.