You can attach files—such as a detailed time report, design drafts, or additional project information—to an invoice before sending it to your client. You can also attach an Expense Report, which will contain receipt images entered with your expenses.
If you're a company that plans to extend credit to your customers, you'll have to get familiar with invoice generation. The invoice is a bill to another business that lists the total amount due along with a breakdown of the items purchased. When it's time to generate invoices to send to your customers, you can make the process simpler by using templates in Microsoft Excel.