CONSOLIDATION OF CONTRACTS.
Tex. FIN Code § 345.078.
in effect(a) If a retail buyer purchases goods or services in a retail installment transaction from a retail seller from whom the buyer has previously purchased goods or services under one or more retail installment contracts and the amounts under those contracts have not been paid in full, the seller may consolidate the subsequent purchase with one or more of the contracts.
(b) If a purchase is consolidated with a retail installment contract under this section, the retail seller may prepare a written memorandum of the subsequent purchase instead of executing a retail installment contract for the purchase. Sections 345.051 , 345.052 , 345.053 , 345.065 , 345.066 , and 345.067 do not apply to the memorandum. The seller shall deliver a copy of the memorandum to the retail buyer before the date on which the first installment under the consolidated contract is due.
(c) Each subsequent purchase that is consolidated with a retail installment contract is a separate retail installment contract under this chapter. The provisions of this chapter relating to a retail installment contract apply to the subsequent purchase except as provided by Subsection (b).