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Are you trying to perform an operation for each billing configuration? As in, create or update a record in NetSuite for each? If so, you'd want to use one-to-many with the path set to this array. If not, I don't fully get your structure, but you'd need to get this into a string array or in a string field separated by commas.

Yeah, I did a one-to-many at the NetSuite import level after passing in an array from the previous lookup.