CA Penal Code Section 1036

(a)

Unless the court reserves jurisdiction to hear other pretrial motions, if a defendant is incarcerated and the court orders a change of venue to another county, the court shall direct the sheriff to deliver the defendant to the custody of the sheriff of the other county for the purpose of trial.

(b)

If the defendant is incarcerated and the court orders that the jury be selected from the county to which the venue would otherwise have been transferred pursuant to Section 1036.7, the court shall direct the sheriff to deliver the defendant to the custody of the sheriff of that county for the purpose of jury selection.