How to send/sync invoice to QuickBooks
Poologics has an integration with QuickBooks Online and allows you to send an invoice(receivable/bill) to QBO
Head over to Projects and select an open/queued job and click on Receivables or Bills.

Select the receivable or bill and click on Send to QuickBooks

If you make changes to the invoice you can then sync it to QuickBooks by clicking on Action followed by Sync