View & Check Unconfirmed Data
Navigate to Accounting > Overview > View Unconfirmed Invoice Items
Select the client & click view:
You can enter a date range for the invoice and select to filter results.
Then you can scroll down to view the line by line breakdown - where you can choose to expand the amount of rows displayed, export to excel and edit the figures if you need to:
Once you are happy with the figures - enter a reference for the invoice and click create: