You can access the Supplier list in Backend Magento → Retail Management → Manage Suppliers
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supplier list on RMS through Purchase Management->Manage Suppliers
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In the list, you can either create new suppliers, edit a supplier, or import supplier from a CSV file.
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How to create a new supplier
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First, you need to click on Add the New Supplier button. You will be redirected to a new supplier details page.
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There are is information that you need to fill in before saving this new supplier.
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Supplier Address: Telephone, Fax, Street, City, Country, Region, Zip/Postal Code, Website
Then you have to add products into this supplier product list.
After filling in all the necessary information, you can click on Save button to save this new supplier.
How to edit an existing supplier
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You can click on View button of a supplier on the list, then you will be redirected to its details page, where you can edit the information of the supplier .or add products to the supplier product list (How to manage the supplier product list in RMS )
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How to import supplier by CSV file
You can learn how to import supplier suppliers by CSV file in How to import supplier by CSV file