How to invoice with new units of measure
Create or edit the invoice manually
You can change the product's new unit from the default one (item) to a custom one by editing an invoice. You can type the product's unit of measure when creating an invoice manually.
New units of measure for WooCommerce products
You can also use the free plugin - Flexible Quantity Measurement Calculator for WooCommerce.
It lets you set the new unit of measure for WooCommerce products. Read more about new units of measure!
The Flexible Invoices plugin is compatible with Flexible Quantity, so the new units of measure will appear on the invoices automatically!