Can I set the Customer selection to default to Cash Sale for Sales Receipts in Quickbooks Online?

Hi there, @info1315.

Allow me to share some details about the cash payment method option in QuickBooks Online.

The sales receipt transaction can be paid through cash, check, or credit card on the event the sale was made. Currently, the option to make the payment option to cash as a default in the sales transaction is unavailable. You can manually select the cash option. 

You may consider checking this article for your future reference about personalizing your sales forms to make it fit your business' products and services: Customise invoices, quotes, and sales receipts in QuickBooks Online. This contains sub-topics such as creating progress invoices and sending printed forms.

Please don't hesitate to let me know in the comment section below if you have other concerns or questions. I'd be happy to help you all the way. Take care and have a beautiful day ahead.