How to create a file in the active Directory - google-apps-script

Question

The problem I have is that the file is created in the root and I cannot find the right instruction to change to a named directory!
// Create a new Spreadsheet and copy the current sheet into it.
var newSpreadsheet = SpreadsheetApp.create( invNo );
var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
invtoSend.copyTo(newSpreadsheet);

Answer 1

just create the spreadSheet, get its ID and then use DriveApp to move it (and to remove it from root otherwise it will be available in both !)
var newSpreadsheet = SpreadsheetApp.create( invNo );
var file = DriveApp.getFileById(newSpreadsheet.getId());
DriveApp.getFolderById('0B3°°°°°°°1lXWkk').addFile( file );
DriveApp.getRootFolder().removeFile(file);
EDIT
I reallize that your question can be understood differently : you might want that the destination folder would be the "current spreadsheet" folder, in this case here is the appropriate code :
function xxxx(){
var newSpreadsheet = SpreadsheetApp.create( "invNo" );
var file = DriveApp.getFileById(newSpreadsheet.getId());
var folders = DriveApp.getFileById(SpreadsheetApp.getActiveSpreadsheet().getId()).getParents();
while(folders.hasNext()){ // a file might be in multiple folders, include it in all of them except root
var folder = folders.next();
if(folder.getName()!=DriveApp.getRootFolder().getName()){ // root folder name changes with user's locale
folder.addFile(file);
DriveApp.getRootFolder().removeFile(file);
Logger.log('destination folder name = '+folder.getName());
}
}
}