old website to new website Old website is running on live. The version of the old website is drupal 6. Last two months ago, I receive a task to create new website by using drupal 7 to replace old one. That time i have 0 knowledge of drupal. Now ready to replace old one and face problem. Old website is drupal 6. New one is drupal 7. Sure have problems.That why i decide to duplicate old website and database to sub domain. Purpose is to upgrade old website from drupal 6 to 7. Old website in sub domain display succesfully, but the link all point to site listing of the sub domain

FYI, I had managed to replace new website D7 to old website D6 successfully. However, the solution is not base on migrate D6 To D7. This question will be remain unanswered...
First thing you should do is contact your web hosting provider and see if you can go back to working copy of your website. After you have a working copy of your website download that into a local environment. I would recommend to this either a Mac or Linux machine (ubuntu os what I user). 

Once you have your local environment you can start trying migrating from D6 to D7. You should never try an migration a production site.

From here you can use drush sup to upgrade your website. After your website is been successful upgrade from D6 to D7. You should consider uploading that to your web hosting provider.