Overview
Product suppliers are managed at the main Business level.

Adding a New Supplier
Once in the Suppliers tab, click New Supplier
Enter in the supplier name, contact information, and representative information
Click Save
Editing an Existing Supplier
From the Suppliers list, click the Supplier to edit
Modify existing details
Click Save
Adding or Changing the Supplier(s) of a Particular Product
Click the Products tab at the Business Manage level
Search for then click on the product whose supplier you wish to add or change
In its product details window, scroll down and click on the Suppliers section
Check or uncheck the desired supplier(s)
Click Save