When you log in as a manager, you'll find that information on the first page.

Log in to your manager account via:  https://www.biddingowl.com/Manager/index.cfm
Click on Alerts > scroll all the way down to the bottom > view Your Auction At A Glance.

Alternatively, you could go to Items > Export Items and tally the spreadsheet. 

Please Note: Exporting your items exports a copy of your items. So, feel free to export as needed.