ORS § 202.320
All processes, writs, bonds, notices, appeals, recognizances, papers and proceedings in actions changed to a new county under the provisions of this chapter issued and made returnable to the circuit court of the county from which a portion has been segregated or organized prior to the creation of such legal subdivision, shall be considered as made, taken and returnable to the circuit court within the boundaries of the judicial district to which the new county or segregated portion has been added. Such bonds, recognizances and obligations shall be payable to the new county and recoverable in the name of such new county, or payable to or recoverable in the name of the county to which the segregated portion has been added by reason of the change in boundaries. All papers and certified copies of all proceedings had in such action shall be transmitted by a court clerk or court administrator of the new county or a court clerk or court administrator of the county acquiring new territory by reason of the change in boundaries.
ORS 202.320