Navigate to Accounting > Merchant Sales.
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To filter for all of the orders without a shipping cost, use the Advanced Search button and select No Shipping Cost on Shipping Cost.
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Click Search to display results.
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Click on the Order ID of the sale you need to add merchant shipping costs for.
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Click the appropriate MSKU if applicable, and add in the cost to the right. It will automatically save and display within the expenses area.
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Navigate to Accounting > Merchant Sales.
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To filter for all of the orders without a shipping cost, use the Advanced Search button and select No Shipping Cost on Shipping Cost.
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Click on Search to display results.
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Click on the Export button to get a .CSV file of the results.
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Open the file and add the amount as a negative number under the Shipping Cost column.
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Save the file.
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Go back to the Accounting > Merchant Sales page and click Import.
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You'll first receive a reminder that is not applicable when adding MFN shipping costs. Select MFN Shipping Cost from the drop-down.
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Once the prompt appears to import, select your file and click Next.
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The next screen allows you to match the fields in InventoryLab with the columns in your .CSV file. The required fields are in red.
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Be sure that you select a column to match with Order ID, Shipping Cost, and MSKU.
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Click Next.