State tax filing

You don't need to. The SC tax forms start out with the Federal income...which already includes interest and dividends. Of course, this assumes you've already entered every source of income in the Federal section. ....don't work on any state forms until every scrap of Federal has been entered....all income, credits, deductions Then NC non-resident must be filled out before working on SC resident forms.... All done in that order.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*