The indices required to be made and kept shall be in lieu of all indices heretofore required of registers; provided, that any register may continue to make and keep such indices previously required, as the register may determine, in addition to the indices required by §§ 10-7-202 — 10-7-205.
Former indices may be made in addition to required indices
Tenn. Code Ann. § 10-7-206, under Index of Public Records.
Tenn. Code Ann. § 10-7-206