Hi there, natashamysgp.
I have the information that will clear everything up about closing books in QuickBooks Online.
The details of your items/products won't be affected by closing your books. This effectively resets the balance of your accounts to zero. This process will also lock your accounting data for the financial period to prevent unwanted changes before you file your taxes.
Use this as a resource to learn more about this process: Close your books in QuickBooks Online.
You can also refer to this article for assistance with your year-end tasks: QuickBooks Online year-end guide and checklist.
Return to this thread if you require assistance or have further questions. I'd be glad to help.
