How do I upload sales line transactions with the same item number but on separate lines using Scribe Insight?

If I do not select "update if exist" to 1, I receive an error. If I select "update if exists" to 1 it overwrites the existing line item for that item number. There are two prior questions on here that did not receive an actual answer that seemed to have this same issue. Surely this can't still be a problem since 2009???

(1) Answer