Unfortunate it a big deal to import configurable products in Magento 1.9.x, simply the core doesn't provide this feature, but we have a solution just open the article below.
How to import configurable products in Magento 1.9.x
Feb 16, 2019 7:13:34 PM
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How to import products using profiles in Magento 1.9.x
Feb 8, 2017 7:01:21 AM
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After launch Magento website you almost need to import products, but how we can do it? I think that the most optimal way of import products in Magento is using import/export profiles, but firstly we have to prepare import profile. By default in Magento we can import products data in two formats: CSV, ExcelXml.