Hey ya'll - quick question. I need to update like 1,000,000+ Sales Orders in our system (seriously 1 mil - no typos) with some historical information. Other than formatting just like fifteen thousand billion CSVs with 24,999 lines each, is there any more optimal/efficient way to perform this update?

Another option is to use the SuiteSolutions CSV Integrator (https://www.netsuite.com/portal/assets/pdf/ds-suitesolutions-csv-integrator.pdf) which NetSuite has now made free. There is a really thorough walk-through video of the solution here: http://blog.prolecto.com/2019/08/18/learn-and-assess-the-value-of-netsuites-csv-integrator-add-on-bundle/