You can set up an order with a configurable product's variations in Magento 2.3 admin panel where the invoice collapses and totals all variations in one line item (configurable item). To do this, you need to follow these steps:
1. Create a configurable product with multiple sizes.
2. Create an order and add the configurable product to the order.
3. In the order, select the "Collapse Configurable Products" checkbox.
4. The invoice will collapse and total all variations in one line item (configurable item).
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