I'm not sure what you are attempting here but I have created a view with 11,8, and 7 on it. To link together the three data sources, you can use a bogus calculated field to link the data. In this case, I created a field named [Link] and set it to 1.
Then I created the Input number of recs as a field and the 'from Open' number of records as a field in the Output data sample Measures. Once all three fields reside within the same data source, we can use Measure names/Measure values in the view to show each. Attached is a 9.3 .twbx with this example as well.
I hope this helps.
Sample Waterfall_PV.twbx 15.7 KB