https://www.pbainbridge.co.uk/2020/04/google-form-use-switch-to-determine.html

Google Form - use a switch to determine save location.gs

function getSaveLocation() {
  
  // get spreadsheet
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  
  // get Config sheet
  var configSheet = ss.getSheetByName('Config');
  
  // get Red Google Drive folder Id
  var redFolderId = configSheet.getRange(3, 2).getValue();
  
  // get Blue Google Drive folder Id
  var blueFolderId = configSheet.getRange(5, 2).getValue();
  
  // get Green Google Drive folder Id
  var greenFolderId = configSheet.getRange(7, 2).getValue();
  
  
  // get data from the Form *****************************************
  var formValues = e.namedValues;
  
  var colour = formValues['Select a colour'];
  Logger.log('Colour is: ' + colour);
  // get data from the Form *****************************************
  
  
  // use a 'switch' to determine appropriate Drive folder to use
  var parentFolderId = '';
  switch (colour[0]) {
    case 'Red':
      parentFolderId = redFolderId;
      break;
    case 'Blue':
      parentFolderId = blueFolderId;
      break;
    case 'Green':
      parentFolderId = greenFolderId;
      break;
  }
  Logger.log('Switch result is: ' + parentFolderId);
  
  
  // get Google Drive folder
  var parentFolder = DriveApp.getFolderById(parentFolderId);
 
}