How to add products to Manufacturer Categories

For video instructions, please watch here:

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In Opencart, go to Catalog -> Products

Select a Manufacturer to filter by and press "Fitler". This will enable an extra orange button called "Manufacturer Categories"
To see all products that are not assigned to a manufacturer category already, you can filter by "Without Manufacturer Categories" (under filter "Manufacturer Categories")

Select the products you want to add to a manufacturer category (using the checkboxes next to each product). Note you can use the additional product filters to make it easier to bulk update products.
Click the orange "Manufacturer Categories" button
Select the Manufacturer Category you want to add the products to
Click save.

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Please note that these updates to the site will only be refreshed every 15 minutes (i,e, although the changes have been made in the backend they will not show on the site for at least 15 minutes)