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Lists > Accounting > Shipping Items
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I tried this but this didn't work @Sai Krishna. Thank you for your response.
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You can't add it there. That is a protected field that NetSuite uses for their shipping integration. NetSuite only integrates with FedEx, UPS and USPS - and only for parcel.
We put our shipping carriers/service levels in Lists > Accounting > Shipping Items. This allows them to appear in the Ship Method list. Not the cleanest way maybe but we use ShipHawk for our shipping integration so this field is only a reference field that we populate via a workflow.