When I am entering bills, do I have to enter all of the invoice information in both the Category and Item details? Why the two and what is the difference?

Hi there, 

Thanks for posting in the Community. It's important you know the difference between the Category and Item details. 

In QuickBooks, categories are used to classify products and services your company sells to customers. For more info on categories, check out this helpful article: 

• Group your products and services into different categories.

Item Details” mainly refers to adding an item from products and services list like the purchase of inventory items by quantity and unit price. It may also help to use for some job costing purposes when job/project cost reports are available in QuickBooks Online Plus plan. Entering the both the Category and Item details depends on your business practice. 

Let me know if you have other questions. I'm here to help.