Domain Access And Subfolders
I am sure you are looking for the Subfolders Domain module.


  Create and configuring easily the hierarchy Subdirectory multi-site for your Drupal multi site from one installation and a single shared database. This module allows you to add new subdomains directories or management of subdomains directories without changing/adding any file configuration (such .htaccess, sites.php, Alias in Apache config file, ...)