Deleting Items from Reminders Overview

An Anonymous poster asks this question:

I just found out about the class drop down that allows my company to track different "areas" of the business so I went back 6 months and put classes on all my invoices, sales receipts, checks, and bills. Now I can make reports to show which "area" of the company earns the most. The bad news is the reminders section is displaying that I have to print out 500 different pieces of paper. The question is how do I delete the reminders from the company screen/ reminder list? Thank you for your time.