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.

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.