For example in your import file are categories, collections associated with products in the file. But in your store collection names are different from your collections in the file. So in this tutorial we will learn how to match collections.

For example, we will analyze collections mapping with such import file: 

In this file we have 2 columns with collections: Main Category and Child category

For example, we have in the file collection Sunglasses but in our store such products should be in the collection Luxury Sunglasses.

To get such result we will need to make such settings: