At any time before a decision entered in a case in which the proceedings are conducted under this section becomes final, the taxpayer or the Secretary may request that further proceedings under this section in such case be discontinued. The Tax Court, or the division thereof hearing such case, may, if it finds that (1) there are reasonable grounds for believing that the amount of the deficiency placed in dispute, or the amount of an overpayment, exceeds the applicable jurisdictional amount described in subsection (a), and (2) the amount of such excess is large enough to justify granting such request, discontinue further proceedings in such case under this section. Upon any such discontinuance, proceedings in such case shall be conducted in the same manner as cases to which the provisions of sections
6214
(a) and
6512
(b) apply.