This is the "Cost Each" multiplied by "Total Qty needed for this shipment" This calculated cost will be the cost for this line.

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If you change the "Cost Each" or the "Total Qty needed for this shipment" this value will update however the "Total Costing" will be set to 0.

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Initially the "total Costing" field is the value of all the "Calc Cost" added together. If you make a change the "Total Costing" field will be set to blank.

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The "Total Costing" field is only a visual of the costs added together. The "Total Costing" field is re-calculated when you "Commit" the order to costing.