generate document from google sheets

function onOpen() {
  var ui = SpreadsheetApp.getUi();
  // Or DocumentApp or FormApp.
  ui.createMenu('XYZ Menu')
      .addItem('Generate PO', 'createDcument')
      .addToUi();
}

function createDcument() {
  var activeSheet = SpreadsheetApp.getActiveSpreadsheet();
  var activeRange = activeSheet.getActiveRange();
  var row_data = activeRange.getDisplayValues();
  var scriptProperties = PropertiesService.getScriptProperties();
  var template_id = scriptProperties.getProperty('template_id');   // document template

  /***Modify indexs if you the spread sheet columns shuffle **/
  var attributes = {
    bill_no: "0",
    vendor: "1" ,
    date: "2" ,
    description: "3" ,
    length: "4" ,
    width: "5",
    height: "6",
    weight: "7"
  }
  /****************/
  var documentId = DriveApp.getFileById(template_id).makeCopy().getId();
  DriveApp.getFileById(documentId).setName('Purchase Order PO# '+ row_data[0][3]);
  var body = DocumentApp.openById(documentId).getBody();
  
  for (var prop in attributes) {
    var index = attributes[prop];
    var propValue = row_data[0][index];
    propValue = propValue ? propValue : "";
    body.replaceText('##'+prop+'##', propValue);
  }
}