If the supplier has some history logged into the Preocro platform there is no way to completely delete the supplier but you can disable the supplier and remove all related visibility. 

To disable a supplier, please follow these steps:

        1. Please go to the Supplier Management → tab and click on Manage Suppliers;

        2. Click on Show filters and find the supplier that you want to disable;

        3. Then in the Action column, click on the edit button;

       4. Move the switcher on the right side of the 'Edit Supplier' row to disable the enabled supplier or vice versa (a switcher should be grey and show "OFF") Update.

Now your supplier is disabled. 

If you decide to re-enable the suppler please see this article.