If the legislative body elects to proceed pursuant to Section 9546, Sections 9523 to 9545, inclusive, shall apply to the reassessments to be levied. Upon confirming the reassessment, the legislative body shall, in the resolution adopted pursuant to Section 9535, order that the lien of the original assessment continue as to the portion of the unpaid principal amount thereof which will be security for the additional bonds which are to be issued on the basis thereof.