I was a partial resident in both MD and FL, but as I entered all of my wage data, I was never asked to allocate my wages between states even though I did enter my residency dates for each state. Also, since Florida does not have state income taxes, TurboTax is currently showing all of my wages in MD.
In the Maryland Part-Year Resident return interview (or in FORMS mode), you should be able to indicate 'Subtractions from Income' on Form 502.
Here's detailed info from the Maryland Dept of Revenue:
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