Hi I am importing products in my 1.7.0.2 new setup, I already added the categories.
when i import the csv product file, all go well. But the problem is the product is added to only subcategory, it is not added to root category at the same time. If the subcategory and root category both are not checked in product edit page then product does not show on the front end. 
I want every product to be added to root and sub categories, I have tried it in many ways but have not succeeded yet. Below are some ways i have applied (3 is root category id and 13 is sub)
  

    _category,category_ids,_root_category
      Abc, 3|13, Root Catalog

    _category,category_ids,_root_category
      Abc, '3,13', Root Catalog

    _category,category_ids,_root_category
      Abc, 3/13, Root Catalog

    _category,_root_category
      Root Catalog/Abc, Root Catalog

    _category,_root_category
      Abc, Root Catalog

even have applied them in single and double quotes as well.

Any help would be very much appreciated.