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Zero delivery is used if the buyer must pay for the order in two stages. The first stage is only for the goods, the second stage is for the delivery itself, which is calculated based on the actual weight and is indicated in the Invoice here when creating the parcel in the Admin Order. Then the total amount of the order is recalculated automatically and notifies the buyer of the need to make an additional payment for the order for delivery.
Thus, it is necessary that delivery be available for the buyer to choose, but show zero cost, then
In the formula field, write “free” (with quotes). And in "Tariffs by country" here , be sure to indicate the shipping cost 0
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