"do I put zero under wages in the PA return for the software to understand my situation?"
Assuming you were domiciled in MD for the entire tax year, yes, that is exactly what you do. Your income is 100% taxable by your domiciliary state of MD. MD residents are not subject to PA income tax on their W2 wages and salaries.
And, as @Mike9241 pointed out, be sure to submit PA Form REV-419 to your PA employer in order to stop the PA withholding.
https://www.revenue.pa.gov/FormsandPublications/FormsforBusinesses/EmployerWithholding/Documents/rev...
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
