How to add values to a series ?

I have typical feature geometries with unique ID and monthly water consumption (Jan-Dec) and I'd like to run a report on that data . So, 1 graph/entity, with a bar chart (12 bars/chart). However, in reporting 5, I really can't figure how to do that : I tried to do that by adding series, it just piles up series one on another... Would someone here have a clue? ( I joined a picture of my data structure and what I'd like to have as a result) .Thx