Report for Detail of Non-Billable Time

The Timekeeper Annual Summary Report is your best option for this report.  Run it sorting for Working Attorney and Current Year Only, specify the year and range of months, and choose Value Type Non-Billable Only.  Choose Working/Client-Matter for Detail.  This will give you one line per Matter.  If the Timekeeper wants the individual fee transaction detail, they will have to use the Fee Filter in the Time Manager and filter for the particular Client-Matter(s) shown on the report.