In such cases, after final judgment, the court shall ascertain whether the property can be sold in parcels, and if it can be done without injury to the interests of the parties, the court shall direct so much only of the premises to be sold, as will be sufficient to pay the amount then due on the mortgage with costs, and the judgment shall remain and be enforced upon any subsequent default, unless the amount due shall be paid before execution of the judgment is perfected.
RCW 61.12.140