Do you need to report how many credits are being used by your company or by your child companies?
You can view this information via Admin Tab > My Account > Transaction History
The 'For Period' box lets you select a date range or previous month to view etc and if you are a partner or Group Account you will see a second drop down option where you can choose a particular account to view or All Transactions or My transactions.
A subtotal of credits used is displayed at the bottom right corner. It will also show your payment history once you buy credits/plans.