Hi- Glad to help, you may check this link out for reference:
Enter historical payroll data
Hi there, @CLL.
I've seen that you've posted a similar question here in the Community. Please refer to my colleague's response through this link: https://quickbooks.intuit.com/community/Employees-and-payroll/W-2-process/m-p/233114.
Please let us know how it goes. If you need anything else, leave a reply below. Thanks for dropping by and take care!
You can enter 2018 data using payroll setup by changing your system date to 2018 to trick it.