Choose File > Print Invoices & Statements.
On the Invoices tab of the Print Invoices & Statements screen, mark the checkbox for each invoice you want to change.
Right-click and choose Edit Selected from the context menu.
From the drop-down list in the first field on the Edit Selected Invoice dialog, select the item you want to modify (Date, Due Date, Notes, Office, or Reference).
In the second field, enter the new value for that item.
If you want to make additional changes to all selected invoices, click the

button to add a new row to the Edit Selected Invoice dialog.
When you have finished all edits, click OK to close the Edit Selected Invoice dialog, then click Yes to confirm.
If any of your invoices could not be edited, the Edit Selected Invoice - Exception Summary dialog opens with a list of exceptions. You can print or copy this information as necessary.