title: Magmi: how to import categories from different columns
body: <p>I have a CSV with 2 columns for categories. 1 column contains the base category of the product and second column contains the sub-category of the product. If no sub is specified the product is considered to belong to the base category. 
  Is there a way to instruct magmi and tell him that the categories should be created from 2 different columns and that column 1 is base category and column 2 sub-category ?</p>