define(['N/search'], function (s) {

  function beforeLoad(context) {
    var newRecord = context.newRecord;
    var parentFields = s.lookupFields({
      "type": s.Type.ENTITY,
      "id": newRecord.getValue({"fieldId": "parent"}),
      "columns": ["isjob"]
    });

    // Not sure if this will be a Boolean or "T"/"F"
    (parentFields.isjob === "T") ? doX() : doY();
  }

  function doX() { ... }

  function doY() { ... }
});