How to handle Multiple Header Rows

[booktrakker]

Hello,

I am working on a project that produces Amazon BookLoader CSV files where the first row is an Identifier header with specific structure and the next two rows are a compound header for each column.

I need to be able to consume and, more importantly, write this file out. I have the basic mapping configured for the third row, but no clue as to how to account for the second row which has to line up with the third row, and the first row which just has to be in a certain structure.

Please advise!