import woocommerce variable product

Hi,

I have a large number of products, I usethe plugin to add my products to WooCommerce , these are variables products , so i have a lot of attributes. In the tutorial I ‘ve seen, when adding an attribute can be on the sheet , select an attribute in a drop down list , and for some reason , all my attributes appear in my painting ” additional Information ” , separated by commas. How to make my attributes are displayed in a scrolling list ?

Thank you in advance.

https://www.ads-software.com/plugins/wp-all-import/