How i can upload images to another folder?

In WordPress we can change the default location of the wp-content folder by defining a couple constants in wp-config.php about it here on Codex

So if the structure on the server looks like this:

/root/
 1. myblog.tld - its own directory
 2. sub.myblog.tld - its own directory 

You can use this in your wp-config.php:

define( 'WP_CONTENT_DIR', dirname( $_SERVER['DOCUMENT_ROOT'] ) . DIRECTORY_SEPARATOR . 'sub.myblog.tld' );
define( 'WP_CONTENT_URL', 'http://sub.myblog.tld');

It will change the upload dir to the one above the current root (myblog.tld to sub.myblog.tld). And the content-url will be sub.myblog.tld