Print order only 1 time when using ‘Custom CSV format’

Hi, is it possible to adjust the default plugin behaviour so to print an order with multiple products only one time when using the “Custom CSV format” option (with addon)?
Since now i used the sample addon from the official documentation, adjusted it to display at least two rows for each order with only the fields I need (a first one with date and order number, the second and followings with order number and product SKU and its qty).
Now the only thing I need is to display every order just a single time in the resulting CSV file, and I can’t figure out how to do it.