function createOfficeSheets() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var dataSheet = ss.getSheetByName("Read Only");

  // Fetch all the data
  var data = getRowsData(dataSheet);

  // This is the data we want to display
  var columnNames = ['Direct', 'Ext', 'Office', 'First Name', 'Last Name', 'Cell Phone'];

  // Index data by office name
  var dataByOffice = {};
  var offices = [];
  for (var i = 0; i < data.length; ++i) {
    var rowData = data[i];
    if (!dataByOffice[rowData.office]) {
      dataByOffice[rowData.office] = [];
      offices.push(rowData.office);
    }
    dataByOffice[rowData.office].push(rowData);
  }

  offices.sort();
  var headerBackgroundColor = dataSheet.getRange(1, 1).getBackgroundColor();
  for (var i = 0; i < offices.length; ++i) {
    var sheet = ss.getSheetByName(offices[i]) || ss.insertSheet(offices[i], ss.getSheets().length);
    sheet.clear();
    var headersRange = sheet.getRange(1, 1, 1, columnNames.length);
    headersRange.setValues([columnNames]);
    headersRange.setBackgroundColor(headerBackgroundColor);
    setRowsData(sheet, dataByOffice[offices[i]]);
  }
}