How to sort 3 measures hierarchically?

I'm visualizing clinical trials data and want to sort universities doing the trials by 3 measures (tbwx attached, Tableau 9.3):

1. Enrolled/Randomized
2. Completed Screening Visits
3. Eligible to Screen

I can sort by Enrolled/Randomized with no problem (tab "Sorted by Enrolled" in the attached).

But - I then want to sort the remaining universities by:

    2. Completed Screening Visits

And if they have only eligible participants, I want to sort those remaining universities by:

    3. Eligible to Screen

I've looked into Index() and using a parameter, but I haven't quite found a way to make this work.

I want it to look like the "Sorted Manually" tab.

Any pointers much appreciated!