I am trying to import product kit from CSV file but I am not getting how to import it as I need to link with products in product kit.
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Refer to the answer to the question about "How to import products to UberCart 3 using CSV data?". It contains a link to Drupal 7 Port of uc_feeds, which seems to include everything that's needed to make this to work by using the Ubercart Feeds Mapper module.
Note: from your recent question "Ubercart Product import containing HTML formatting in product description", I'm assuming that you are referring to the Ubercart Feeds Mapper module (instead of "Ubercart 'product' mapper" ...
Importing from CSV files also details the steps required for such import. The process consists of 3 steps. Here is a summary of these steps:
Attention, the 'Node Import' module does not have a D7 version, only a D6 version.