With Payable Sheets you can add up to 5 line items to 1 invoice, enabling you to give a more detailed breakdown of goods or services rendered to your customers.

Here you can see there are 5 line items with various individual prices under one order. The recipient's email and invoice ID need only to be logged on the first row.
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When you have entered the Item Label and Item Amount for your additional line items, click the Payable Order ID cell, and manually adjust the formula input to include the last row of your D column for the invoice. In this example, the invoice is including Item Label cell C5 to Item Amount cell D9. Once you have updated the formula for this invoice, you will see the Payable Total cell update to include the multiple price amounts.