Category Mapping osCommerce

We run a oscommerce shop and import Products from vendor via easypoulate. Need to create a category mapping script. The easypopulate file contains the categorie fields v_categories_name_1_2 v_categories_name_2_2 v_categories_name_3_2 so we need mapping the imported categories to the existing shop categories. The script must save the previos mapping if a new file is imported. If you need more info please contact me.