Can I file my 2018 and 2019 W2's together?

[ee-ea]

No

Each year is separate

How to do the 2018  https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-prior-year-tax-return/00/25...

[KrisD15]

@shanterica-smith

No, the 2018 W-2 gets entered on a 2018 tax year return and the 2019 W-2 goes on a 2019 tax year return. 

Please use the link below for 2018 software:  

2018 TurboTax