Hello jzadra,
I, too, couldn't locate the utility at first. I did a quick look at the program file folder for Direct RT and found it here:
DirectRT/Utilities/Data Restructure (DirectRT)/data_restructure
Inside is a documentation file in MS word that guides you through the restructuring process. It looks like the terms "restructure" and "reducer" are both used.
Hope this is what you are looking for-seems like it will be a real time saver.