To do this job, you can run “Sales by Customer Summary” report.
You will need to customize the report to show daily sales and change to cash basis.
If you are using custom fields for sales rep on the Invoice, you can match the sales by Sales Rep as well.
See attached screenshot photo1, photo2 and photo3 for reference.
There’s no way to convert that Invoice to an Estimate.
QuickBooks Online doesn’t have a mechanism in place to create Estimates out of Invoices. You’ll have to manually create the Estimate and delete the Invoice.
This QBO tutorial video is a step-by-step guide to complete invoicing process (Customer Invoicing, Sales Receipt, Receive Payment and Bank Deposit). It covers how to handle all forms of payments like check, credit card, debit card, PayPal and Amazon payments. It explains how to record merchant service fees as well as PayPal and Amazon fees. It also explains how to match bank downloaded transactions.