Pledge Payments and Batches

We use Batches to reconcile daily donation deposits in our accounting software to the donor in Salesforce. The batch field can only be linked on an opportunity one time. However, for pledges that have multiple payment dates, I need to be able to enter a batch number for each payment, but the batch won't show up on the payment screen, just the opportunity. I don't really need the opportunity to have a batch, I need the payments to have a batch. How do I do this? I have spent countless hours trying to figure this out, reading through this community, watching videos, etc. Nothing works.