If you are able to access the Billing WorkCenter but your page looks like the image below then there is a likely solution.
For further guidance on using Finance WorkCenters, please refer to the following Quick Reference Guide on the ctcLink Reference Center: https://ctclinkreferencecenter.ctclink.us/m/94738/l/1076596-9-2-finance-workcenters-centers-and-dashboards#using-billing-workcenter