I have an estimate with many line items, where each line item is a job. I plan to invoice the customer for 50% at start of job, 25$ when half done and the balance 25% on completion. I periodically invoice and charge each line item based on the status/progress of each line item item.

I plan to use progress invoicing with Custom Amount for each line:

How does one determine how much of the line item is pending (or charged). Also in which invoice(s) is the customer charged.

I create the first Progress Invoice and specify the amount for each line item. When I attempt the second Progress Invoice, again using Custom Amount for each line, I don't see the how much is pending.

Is there either a view or report that shows for each line item the following pieces for information:
- Line Item Total amount
- Amount Invoiced
- List of Invoices this line item was invoiced with amount