How to add new products with WooCommerce on your WordPress site
Log in to your WP Admin panel.
Navigate to "Products">"Add Product".
Tick the categories on the right side.
In the "Inventory" tab, define a unique SKU (this will automatically increment on the last one if you don't set it).
The attributes tab is where you'll set all your fields.
With the dropdown "Custom product attribute" select each one and then click "Add".
Loop through each of the attributes and add all the relevant ones for that product (for example, if a certain model of the product is available in several colours, enter each distinct colour).