WooCommerce Product Stock Updates Plugin

The plugin must be open source, and the copyright to the code remains mine.
The plugin is used to quickly and easily update the stock quantities of WooCommerce products.
Here I attach the 4+1 steps of the plugin (in HTML+CSS format) with a ready-made example interface in English and the .xls file with the product code mapping.

0) Create the installable plugin by uploading a .zip file. It's called: Update stock, author: Matteo Raggi.
1) Import the supplier .xls file.
2) Import the WooCommerce supplier code and product SKU mapping file.
3) Display the list of correspondences between website SKUs and WooCommerce product codes, mediated by the map.xls file.
4) Import the products from supplier.xls and update only the warehouse fields of the products whose SKU matches the product code in map.xls.

5) Confirm imported products

The client's website has a cron job that runs every 8 minutes. The store has approximately 6,500 products in Italian and 6,500 in English, translated with the wpml plugin. The current mapping file is 3,913 lines long, and the only supplier file that will be imported contains 8,868 products.