It's true that South Carolina will allow you to file as a resident or non-resident if you lived in the start for part of the year. However, the tax treatment of resident and Non-resident SC returns are very different from one another.
When filing as a resident of South Carolina, the addbacks for the differences in the itemized deduction and the state addbacks are on page 1 of SC 1040. If you file as a non-resident, this part of the SC 1040 is blank because the income determination and addbacks of Standard and itemized deductions occur on Schedule NR near line 46. I have a test case open in the download version of TurboTax that is figuring the South Carolina deductions and addbacks correctly.
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