You are installing the store-side of Php-MultiShop, based on osCommerce (thereafter with some changes), to realize a Virtual Mall.

After the installation of the portal-side (based on PHPNuke), you can use this installation to create one store in your platform.

Also, if you want to install another store, simply copy the content of the 'store' folder in a new directory on your server, then repeat this installation for the new store.