adjustments

Spreadsheet Column Header: adjustments

Default: Blank

You can add or subtract a dollar amount from the total shipment cost using the Adjustments field.
Enter the shipping method ID followed by an equals sign, and the dollar amount. To subtract a dollar amount, enter a minus sign before the amount.
Example: 2=10 – This will add $10 to shipping method ID 2 for each quantity of this item ordered.
Example: 2=-5 – This will subtract $5 from shipping method ID 2 for each quantity of this item ordered.

Use a comma between each shipping method like this:
2=10,3=7