Since you've already entered your South Carolina return, click State in the left pane of TurboTax Online, and then click Continue or Edit next to the state.
Then, answer the questions on the first few screens, until you come to a page Here's the income that South Carolina handles differently.
Towards the bottom of that page, you'll see a heading Public service, then just below that, "Subsistence Allowance." Click Start or Edit to enter your information.
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