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I’m in the processing of transporting my e-store to Magento and imported about 800 products. However, I can’t seem to work out how to assign attributes to existing products, only to those I am creating on the fly.
I seem to recall having a similar problem. I found that when I added a product attribute _after_ the product, the product didn’t know about the attribute. Try going to the relevant catalog_product_entity_<type> table in the database and adding in a row for each product for each attribute. Also make sure that you have added the attribute to the correct attribute set, and group within that set.