The W-2 worksheets will by included in the PDF download for prior year online tax returns.
To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
You can get a free Wage and Income transcript from the IRS - https://www.irs.gov/individuals/get-transcript
Assuming you are referring to the TurboTax online web based tax returns -
Which tax year?
Tax years 2017 thru 2015 will include all worksheets including the W-2 worksheet that has the tax data entered from the W-2 that was used on the tax return.
Tax years prior to 2015 will only include the tax return forms and schedules need to file a tax return.
Tax year 2018 to access all forms, schedules and worksheets has to be downloaded from Print Center -
When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state.
This will take you back to the 2018 online tax return.
Click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. Choose the option Include government and TurboTax worksheets