Reddit reviews South Carolina's Military Organizations During the War Between the States: The Lowcountry & Pee Dee
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You should check out Robert Siegler's four books on South Carolina units, it's very comprehensive (down to individual company commanders in many cases) and breaks SC down regionally. Here's a link to one of them. It might also do you some good to contact the Relic Room in Columbia.
If I can point out any more SC specific Civil War resources let me know.