@Des Some fields have the hierarchy and some don't. In general the rule is that if you enter it the exact same way you see it in the UI, it should go in okay (assuming your custom forms, workflows, scripts, etc. are all the same). Back in the day when I was still learning CSV imports I'd have the Mapping up on one screen, the UI up in another, and my file/template in a third so I could easily see all of them together.