Editing individual Branches in a Partitioned List

Hello,

I made a small definition generating a row of rectangles with random lenghts, see attached 'Row of Rectangles' .gh and .jpg.

I would like to partition this row and assign different Y coordinates to the individual branches to achieve what's shown in 'Row of Rectangles with Different Y Coordinates.jpg'

I tried partitioning the list, which resulted in multiple rows of rectangles on top of each other, but didn't find out how to intelligently assign the different Y coordinates to the branches...

Seems like there must be a straight forward way to do this?

Best,

dominik