Conditionally Merge Multiple Attributes – CTX Feed
CTX Feed can be used to merge multiple product attributes together. Before you start please read the detailed documentation about how to configure a dynamic attribute.
Suppose you want to add a Product short description if the Product description is empty.
Here’s a graphical illustration of such an event and how the CTX Feed dynamic attribute feature helps to sort it out:

You can also learn How To Merge Multiple Attributes By Using Attribute Mapping with CTX feed WooCommerce product feed generator plugin in this following video tutorial: