Tex. Civil Practice and Remedies Code § 63.005

(a) If a garnishee other than a foreign corporation is not a resident of the county in which the original suit is pending or was tried and a party to the suit files an affidavit controverting the garnishee's answer, the issues raised by the answer and controverting affidavit shall be tried in the county in which the garnishee resides. The issues may be tried in a court of that county that has jurisdiction of the amount of the original judgment if the plaintiff files with the court a certified copy of the judgment in the original suit and a certified copy of the proceedings in garnishment, including the plaintiff's application for the writ, the garnishee's answer, and the controverting affidavit.

(b) If a garnishee whose answer is controverted is a foreign corporation, the issues raised by the answer and controverting affidavit shall be tried in the court in which the original suit is pending or was tried.