This is for clients with more than one matter open with your firm at a time. It is like a cover or summary sheet for all that client's matters billed this period. Once you have printed all your actual bills, you can print your client combined matters cover pages. The system knows which matters to include based on who was billed this period, found in the posting file. (Be sure before printing your current bills, that all previous bills have been posted.) It is a good way to attempt to get payment in full from your client and avoid confusion.