Follow the Quick How-To Examples for Invoicing a Single Client, Invoicing Multiple Clients, or Invoicing Clients Based on Range of Dates to create an invoice from billing hours and/or reimbursable expenses. Go to the Bill Batches Tab or the Invoices Tab in the Accounting Center to find your invoice. Click on the Edit link under the Commands column. Add whatever line items you would like to the invoice and then click the Save & Close button.