Hello Daniel,
Thanks for reaching out.
> “i have seen the documentation and followed the steps but do not see the option of adding a new cost for new lot.”
To add a cost for the product, please go to Edit Product > Product data > General section. There, you can add the cost of the product in the Cost field. You can also add the cost of the products from Tools > Bulk Edit Costs section.
> “when trying to add the cost of a payment gateway, the save changes button is dead. not responsive.”
I couldn’t reproduce the issue on our end. Please ensure that you are using the latest versions of the WordPress (6.1.1) and WooCommerce (7.1.0) plugin.
Kind regards,
Moshtafizur