How to Create a [Spend Y in X Get Item Discount] promotion for one gift added automatically

Summary:

How to Create a promotion that allows you to add the gift automatically, but has a spending condition

Content (required):

I need to create a promotion of the type "Spend Y in X Get Item Discount", where eCommerce add the gift automatically without the client adding it manually

Version (include the version you are using, if applicable):

21.3.10

Code Snippet (add any code snippets that support your topic, if applicable):