If you have set up your listing so that it is 'good till cancelled' it will renew itself every 30 days and the amount sold will carry over. But if you set up the listing to end every 30 days or less, the number will not carry over.
If you have set up your listing so that it is 'good till cancelled' it will renew itself every 30 days and the amount sold will carry over. But if you set up the listing to end every 30 days or less, the number will not carry over.