Anyone work on a scenario where a sales order and/or invoice could potentially have a couple thousand line items on it? Potentially over 10,000 lines. Will NetSuite handle this or will it be an issue? SuiteAnswers mentions some limits on how much can be added at a time through the UI or via CSV/Web Services, but makes no mention of a total maximum limit. Curious if it will actually handle this OK.

NBC Universal had that amount of lines on their sales orders so it looks like NS could definitely handle that much.

https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_N550610.html#subsect_162003757652 The limit for transactions submitted through the user interface is 500 lines. For transactions submitted through CSV import or SOAP web services, the limit is 5,000 lines per transaction. After you submit transactions exceeding the 500 lines limit through the CSV import or SOAP web services, you must do all additional changes and edits through the CSV import or SOAP web services.For journal entries, these limits are 1,000 lines for the user interface and for synchronous SOAP web services, and 10,000 lines for CSV import and asynchronous SOAP web services. You should limit yourself to 200 lines or less on a purchase order unless they are to be received by WebServices.

Just an FYI if you have to split stuff up anyway, I'd stay way lower than limits if you ever intend to look at those docs in the UI. The performance in the UI is awful for any doc at or near the line limits.