146. Alteration in allowance.
(1) On proof of a change in the circumstances of any person, receiving, under section 144 a monthly allowance for the maintenance or interim maintenance, or ordered under the same section to pay a monthly allowance for the maintenance, or interim maintenance, to his wife, child, father or mother, as the case may be, the Magistrate may make such alteration, as he thinks fit, in the allowance for the maintenance or the interim maintenance, as the case may be.
(2) Where it appears to the Magistrate that in consequence of any decision of a competent Civil Court, any order made under section 144 should be cancelled or varied, he shall cancel the order or, as the case may be, vary the same accordingly.
(3) Where any order has been made under section 144 in favour of a woman who has been divorced by, or has obtained a divorce from, her husband, the Magistrate shall, if he is satisfied that—
(a) the woman has, after the date of such divorce, remarried, cancel such order as from the date of her remarriage;
(b) the woman has been divorced by her husband and that she has received, whether before or after the date of the said order, the whole of the sum which, under any customary or personal law applicable to the parties, was payable on such divorce, cancel such order,—
(i) in the case where such sum was paid before such order, from the date on which such order was made;
(ii) in any other case, from the date of expiry of the period, if any, for which maintenance has been actually paid by the husband to the woman;
(c) the woman has obtained a divorce from her husband and that she had voluntarily surrendered her rights to maintenance or interim maintenance, as the case may be, after her divorce, cancel the order from the date thereof.
(4) At the time of making any decree for the recovery of any maintenance or dowry by any person, to whom a monthly allowance for the maintenance and interim maintenance or any of them has been ordered to be paid under section 144, the Civil Court shall take into account the sum which has been paid to, or recovered by, such person as monthly allowance for the maintenance and interim maintenance or any of them, as the case may be, in pursuance
of the said order.

Note: No changes at all

BNSS Sec 144 is here. BNSS Sec 145 is here. BNSS Sec 147 is here.

Entire Sanhita available here.