In this tutorial we will find out how to concatenate field from import file and text that is needed.

For example you need to import product images, but in your file are just image names and for import required URL for image and you need to add url path for folder where are your images located. We can do this using Custom Fields feature. 

Suppose that in your file field with image name is - image. So to get the full url for image we create custom field this formula type String and such formula: https://example.com/img/[image] where (https://example.com/img/) is url to your images folder.

Then you save your import template and select created custom field for images import: