There is a Bill Book report that can be run into Excel then sorted, this is found in the below location:
From the Main Menu go into Advanced Report Execution.
Select Accounts Standard folder.
Click the plus on the Debtors folder.
There are a few different Bill Book reports select the one that is relevant for the information you need.
If you require a bill book not by matter fee earner then the Bill Book By Fee Earner report should show that detail, if you check the Report Notes they should tell you.
Put in all the correct periods and default information.
Select Excel in the Output field.
For the bill number to be displayed untick the box Suppress Detail Lines.
Select ACCEPT.