CSV Importer Plus Pro imports custom taxonomies into posts, pages, and custom post types. You can import as many taxonomies as you like. This feature is available in both the free and pro versions. The CSV Importer Plus Pro for ACF plugin can import custom taxonomies with parent-child relationships. To define these relationships, use > (e.g., Color1 > Color2, Color3). Here, Color2 is a child of Color1. Please note that you must enable the Hierarchical setting and set its value to true for this to work.
Key Mapping Format
When mapping custom taxonomies, use the taxonomy slug, such as color_types or car_types.
Here, color_types and car_types are the slugs of custom taxonomies.
After providing the correct column names in the CSV using the specified format, the plugin will automatically map them.