Enter this code in your .htaccess file after the
RewriteEngine On line:
RewriteCond %{HTTP_HOST} ^your-site\.com [NC,OR]
RewriteCond %{HTTP_HOST} ^(www\.)?blablabla\.bg[NC]
RewriteRule (.*) http://www.your-site.com/$1 [L,R=301]
Redirect 301 /home http://www.your-site.com/