Drupal commerce Rules help

Hello, I need help finishing a rule for Drupal 7 commerce that automatically add product variations to a product display node. The rule is ready, it works fine, the only missing element is the following: 1) I have two product variations (automatically created within the same rule) 2) Next, I need help assigning the product variations to the Product Display node. You need to have experience working with Drupal Commerce and rules. Either you add custom PHP code to the rule to achieve the functionality or you know how to do it using "set data value" in rules.