When any surplus is left remaining unexpended and unappropriated in the county general fund, the county road fund, the school fund, or any other special fund provided by law from any previous year, the county court of any such county is authorized, by proper order made and entered, to transfer and add the surplus to the respective funds of which the surplus remains unexpended and use it as the revenues for the current fiscal year into which it is transferred and added if all outstanding indebtedness for the fiscal years in which the surplus accrued has been paid.