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show ONLY the brands (attribute) that are used by a product
Hello, We have an extension that can take care of the this without any coding. Have a look at our Shop By Brands extension and you’ll be blown away with the functionality provided with this magento extension. have a look and let us know if it suites you.
You can get great Ã¢â¬Ëshop by brandÃ¢â¬â¢ functionality with Improved Navigation Extension.
It allows to create brand pages(http://improved-navigation.amasty.com/amd.html). Also with it you can make lists of all brands in nice alphabetically ordered blocks, create the Ã¢â¬Åfeatured brandsÃ¢â¬Â block and have nice short urls for brand pages.