Hello there, @pastorarosilia.

I'm glad you've reached out to us. Let me help and walk you through on how to add an item on the W-2 form. 

If you'd like to reflect the item in the W-2 form, you'll have the option to manually report the transit tax in Box 14. To do this, here's how:

1. Go to the Employees tab and select Payroll Tax Forms & W-2s.
2. Choose Process Payroll Forms.
3. Double-click the Annual Form W-2/W-3 Wage and Tax Statement/Transmittal.
4. Enter the correct year, then click on OK.
5. Mark the employees you want to view.
6. Click Review/Edit.
7. Click the Form W-2 link at the top of the form.
8. In Box 14, enter the transit tax description and the amount.
9. Click the Check for errors button.

Once done, you can now file the W-2 form. For additional reference, you can check this article: Process and file W-2 forms. 

If you need further assistance with the steps, I recommend calling our QuickBooks Online Support Team. They have additional tools to pull up your account and do a remote session. 

You can reached our phone support through this link: https://payroll.intuit.com/support/contact/?infosrc=qs&service=64. 

Please know  that I'm just a post away if you have any other concerns about W-2 form. Have a good  day ahead.