Interface for users that need to fill in data for thousands of items

The problem I encounter is that I have thousands of items a day (e.g. transactions of toys that have been purchased in a store). My goal is to provide the users with an interface to fill in manually 10+ data fields on this transaction (e.g. toy category, is it the main toy or something you purchase as extra, what age is it for, etc.). Then, I would categorize the data by the information the users provided me. How would you recommend doing it?

Thanks!