1. From a payment record that contains at least one allocation, clickAllocations.
2. From the Existing Invoice Line Allocations list, find the payment allocation you want to unallocate and click Unallocate.Invoice lines that received an allocation from that payment reset their balance and payment fields to their values before the allocation was applied.
3. From the Invoice Lines section, find the different invoice containing lines that you want to allocate the payment toward, and then select those invoice lines.
4. Choose an amount for each of the lines.
5. Click Allocate.If you paid off an invoice line in full, Salesforce Billing removes it from the payment allocation page and updates its status to Paid. If you made a partial payment, you’ll see the invoice line on the payment allocation page with an updated balance.