If a proceeding for enforcement of child support has previously been brought against an obligor under this subchapter and the obligor at any time thereafter fails to pay support in an amount equal to one-twelfth of the annual support obligation, the court may, in addition to any other remedies under this subchapter, order that existing liquid assets be held in escrow by the court sufficient to secure payment of support for a period not to exceed four months. If the obligor fails to pay support in an amount equal to one-twelfth of the annual support obligation, the assets held in escrow shall be applied toward unpaid support. (Added 1989, No. 220 (Adj. Sess.), § 14.)