1. Go to 'Business Setup' and select 'Product Provider' from the drop-down.
2. Select the respective Product Provider from the list which you want to unsubscribe
3. You will see an Unsubscribe button appearing at the right bottom of the screen.
4. After selecting the product provider just click on the Unsubscribe button present on the right bottom of the screen.
5. Product Provider will be unsubscribed.