Ever wanted to export & import script properties in Google App Scripts? Here's a simple copy & paste method.

scriptPropertiesExport_Import.gs

/**
 * Script for the original Google App Script from which you want to export the script properties.
 * Shows in the log the script properties in JSON-encoded object; use with scriptPropertiesImport() described below
 */
function scriptPropertiesExport() {
  var properties = JSON.stringify(PropertiesService.getScriptProperties().getProperties());
  Logger.log(properties);
}


/**
 * Script for the new Google App Script to which you want to import the above-exported script properties.
 * Copy & paste into the below var properties the JSON-encoded object shown in log after running scriptPropertiesExport()
 */
function scriptPropertiesImport() {
  var properties = {'Copy and Paste here'};
  PropertiesService.getScriptProperties().setProperties(properties, false);
}