Structuring data for waterfall visual

I want to create a visual similar to the one below, but I need help figuring out how to structure the data so it can be visualized like the example below. 

My data sources consist of current and previous month headcount rosters, terminations and hires list, as well as other lists of headcount additions. My initial was to create measures to aggregate each of the figures I wanted to represent on the chart and then add them to the waterfall visual but this simply didn't work since the waterfall visual only takes one field for the y-axis.

I appreciate any ideas on how to structure the data so it's compatible with the waterfall visual or ay other approaches that might get me the same result.