The Lawyers' WIP Billing & Collection report is a monthly report...
Having said that, the information on this report is drawn from other reports that in fact can be run weekly or for any time period in increments of days.
Billable Work - Reports>Productivity>Time Listing - run the Time Listing for the working lawyer or alternately, Reports>Productivity>Time Summary
Billed fees - Reports>Journal>Invoice - by fee credit lawyer
Fee Adj - Reports>Productivity>Fee Adjusmtnets - by fee credit lawyer
Fee Write offs - Reports>Journal>Write Up/Down - by fee credit lawyer
Each of the above can be saved as an excel spreadsheet - if that helps - except the Write Up/Down Journal. You can save the Write Up/Down as 'txt' rather than 'xls' and import into Excel.
Create a Report Group with the above reports and run weekly for a weekly view of the information.
I hope this helps.