1) Log in to your Shopify admin panel and press “products” on the left:
2) Select all the products by using the upper checkbox:
3) Press Bulk Edit in the pop-up window:
4) Press columns to select the fields you we need to fill in:
5) Click on “barcode” and “SKU”
6) Please enter your SKU information, and barcode information (this can be duplicated information)