Here is box by box breakdown of your amounts on the Form 504 K-1, and where they go in TurboTax:
Box 1 is your share of taxable income. I assume this amount is the same as your federal K-1, and if so it is already captured by your federal K-1 entry and doesn't need to be entered again.
Box 3 is for Maryland "additions", and you should have an area in your MD state return for "Additions".
Box 4 is for Maryland "subtractions" and you should have an area in your MD state return for "Subtractions".
To enter your Form 504 K-1 additions and subtractions, in your Maryland state tax return find the screen "Here's the income that Maryland handles differently". Scroll down to the Business section of that page, and find the Partnership and S Corporations Adjustments line. Click to Start or Revisit that section. You should get a question "Estate and Trust Additions". Answer Yes, and then on the next screen enter the name of the trust and the amount of your MD K-1 box 3 additions. Next, Continue and you'll get a screen for "Estate and Trust Subtractions". Answer Yes, and you'll get a box to enter your MD K-1 box 4 subtractions (enter as a positive number). Your Maryland Form 502 will now include the additions and subtractions related to your MD K-1.
Note that if any if the income from the federal K-1 is interest or dividend income, you may have answered a question about how much of that was from U.S obligations. TurboTax will automatically deduct that as a subtraction from your Maryland return. So, check line 13 of your Form 502 to make sure you don't "double-up" the Maryland subtraction by entering that "income from U.S. obligations" a second time as a trust subtraction.
For more information on what is being added and subtracted, see page 4 of the Maryland Fiduciary return instructions PDF at this link.
[Edited 03/06/2020|9:16am PST]
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