There are a few reports that can be run these can be picked up from the below:
From the Main Menu go into Advanced Report Execution.
Select Accounts Standard folder.
Select the Debtors folder.
Double Click on the Bill Book report.
Select the periods you require the bills from and the Output needed.
Select ACCEPT.
Also there is a report in the WIP folder.
Select Matter and Fee Earner Reports folder.
Double Click Fees Billed and WIP Outstanding report.
Select the Output of the report and Accept.