Hello.
Store Manager for PrestaShop requires a specific format of the .csv file to import product attribtues/combinations.
In order to get an example .csv file, you can create a test product with combinations in the Store Manager and then export it to the .csv file using Import/Export Wizard.
Also you may find a detailed documentation on how to export and import products in the articles below:
http://store-manager-for-prestashop-documentation.emagicone.com/prestashop-product-management/export-prestashop-products
http://store-manager-for-prestashop-documentation.emagicone.com/prestashop-product-management/import-prestashop-products