I have been trying and hoping for an answer for months. I also posted this other related question here https://quickbooks.intuit.com/community/Account-management/The-quot-Sales-by-Product-Service-Detail-...

Both sales by customer or sales by product detail reports only work if you select non-posting. They show nothing when selecting estimates. The problem with non-posting is that it shows both estimates and cash.

Even better, give me "Estimates & Progress Invoicing Summary by Customer Report" but detail instead of summary. I need to see each line item in the estimate, not just the total.