hi!, to do advanced stuff using xlsx recipe you need to understand the Office Open XML SpreadsheetML File Format standard, as you probably know this standard is very heavy an we can not put all advanced use cases in the documentation.. if you look for more information about the standard you can look
here (this link is also in our docs).
Also, please note that we are migrating from google groups to our custom forum, you can register
here and post more questions.