drupal 7 multisites with subdomain

I have a drupal multi-site and work ok with differents data base but they use the same files folder and I want a different files folder.. example: tfe.com reef.tfe.com [sites] folder structure -[default] ————settings.php ————[files] -[reef.tfe.com] ———-setting.php ———–[files] /***data****/ The connection to different data base[…]