I appreciate you for your post regarding the billing percentages in QuickBooks Desktop (QBDT). I know how crucial it is for your billing to reflect accurate information. Let me clarify how calculation works and help you find the best solution.

I understand that you expected a total percentage of 75% by adding the two items. However, the first item has already been fully billed and the system does not include it in the current calculation. Since only 50% of the second line item was currently billed, therefore the total percentage should be 50% as well.

Furthermore, here are some articles that can guide you in managing your invoices more effectively:

• Verify that an invoice was emailed and read by recipient
• Remove or unapply a credit from an invoice or bill

Let us know if you have further questions about managing your invoices in QBDT. We'll be right here to help you anytime.