If you have customer data and also act as a supplier of your products. You no longer need to create or add supplier data manually. You just need to follow a few simple steps as follows:
Step 1. Go To Menu Contact
click on one of the customer names that you want to make as a supplier too
Step 2. Click the Down Arrow Button on the Contact Details Page, Then Click "Create Supplier From This Customer"
Step 3. Create Supplier From Customer Contact Successfully
You can try to make sure again in the contact supplier data :