Okla. Stat. tit. 20, § 20-642: Procedure for transfer

Upon showing by the plaintiff or defendant in all civil and

criminal cases; or some interested person in probate matters, being

filed by the clerk of the court, that the venue of said cause is in

some other county as provided by the preceding section, the court

shall order the transfer of such case or probate matter to such

other county; and, upon such order being made, the clerk of the

court shall prepare a transcript of all the papers filed, orders

entered and a bill of the costs accrued, and shall forthwith

transmit the said files and transcript of said cause by registered

mail, to the court or clerk of the court of the proper county.