The sales forms available in QuickBooks are:
Sales receipts (if you get paid immediately by cash, check, or credit
Invoices (if you get paid later)
Credit memos (for recording a return, a refund, or an overpayment)
Statements (or billing statements, for periodic billing or to let your
customer know how much is past due)
Estimates (also known as bids, grants, or proposals, for describing work or products you propose to a customer)
Invoices or sales receipts are the forms that you give to your customers to
confirm their orders. Even if you do not want (or need) to give your customers
a printed copy of the QuickBooks invoice, you should still use the invoice or
sales receipt form to enter your sales into QuickBooks (so that your income
information is up to date).
Depending on your type of sales business, you can enter each customer
purchase on a separate sales form, or you can enter a daily sales summary of
all your sales.