If you want to use CloudExtend to update the price of an item(s) on a NetSuite record, the CloudExtend Picklist will not display a Custom value in the drop-down list due to a NetSuite WebServices limitation. To customize a price level do the following:
Step 1: In the Item List: Price column, enter [[-1]] which is the internalID for Custom Price.
Step 2: Enter the Custom Rate in the Item List: Rate column.
Step 3: Click Update and then Upsert All Records (4) on the CloudExtend toolbar. CloudExtend will then create or update that record with the Custom Price level.