N.C. Gen. Stat. § 115C-474
In any county where the bonds of a local district have been assumed under the provisions of this Article, all taxes levied and collected for the purpose of paying the principal of and interest on said bonds, or for creating a sinking fund for the retirement of said bonds, shall be deposited in the school debt service fund of the county. The custodian of all moneys and other assets of a sinking fund created for the retirement of said bonds is hereby authorized to turn over such moneys and assets to the county treasurer, the county sinking fund commissioner or other county officer charged with the custodianship of sinking funds, and such custodian shall thereby be discharged from further responsibility for administration of and accounting for such sinking fund.
N.C. Gen. Stat. § 115C-474