The document describes an expense management system built using Oracle BPM 11G. It allows employees to submit expense reports using a portal or mobile app. Expenses are approved in a multi-level workflow by managers at different levels. Level 1 users submit expenses, level 2 users approve level 1 expenses and submit their own. Level 3 users approve level 2 expenses and view reports of their subordinates. Level 4 is the highest approval level who can view expenses of level 3 users and their subordinates. The document walks through screenshots of the expense submission and approval process by users of different levels.