When you enter your W-2 in your Federal Return (with state wage info) TurboTax calculates your Maryland Income for you on the Maryland return. You don't need to enter anything for 'Non-Maryland Income' unless you had other income not reported on a W-2 that was included on your Federal return.
If you had Capital Gains/Loss (or Business Gains/Loss) on your Federal return, divide that amount by 12, then multiply by 9.5 to calculate 'Non-Maryland Losses/Adjustments' for the time you didn't live in Maryland.
Click this link for more details on Allocating Part-Year Resident Income.
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