Hi Suzana,
I am surprised that you have not received a response to your question so far.
There is a thorough and detailed explanation of how to handle salary sacrifice in QuickBooks 2009/10 onwards. While it is an old article, the procedures remain valid today.
Look at the link:
http://library.reckon.com.au/library/pdf/Super Salary Sacrifice in QBI.pdf
Good luck,
Janos