Although Store Commander's CSV export tool does not include a filter allowing you to export only products associated to a specific supplier, or manufacturer, here is how you can work it around:
Export your products including 'Supplier' field in your mapping.
Then filter the column 'Supplier' in the CSV file generated.
Display all your products (Catalog > Products List) in the Large view.
Select the name of the supplier in the drop-down menu of the filtering tool.
Finally, export the data displayed using the quick export option icon on the toolbar.
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