Ind. Code § 36-10-9-13
(b) In authorizing the issuance of revenue bonds, the board may:
(2) authorize the issuance from time to time of additional revenue bonds secured by the same lien.
Additional revenue bonds shall be issued on the terms and conditions provided in the bond resolution or resolutions adopted by the board and in the trust agreement or any agreement supplemental to the trust agreement. Additional revenue bonds may be secured equally and ratably without preference, priority, or distinction with the original issue of revenue bonds or may be made junior to the original issue of revenue bonds.
(d) Any trust agreement or resolution providing for the issuance of revenue bonds may contain provisions for protecting and enforcing the rights and remedies of the bondholders that are reasonable and proper and not in violation of law. The provisions may include convenants stating the duties of the board in relation to:
(g) All expenses incurred in carrying out a trust agreement entered into under this section may be treated as a part of the necessary operating expenses of the board.
As added by Acts 1982, P.L.77, SEC.28.