Splitting list problem

Hi guys. I've a problem. Example: I've 3 floors, each one with different number of rooms. I do a daylight analysis for each rooms for each floor and I need that results are putted in a list (with the same partitions like the yellow one). But there is a problem: Daylight simulation is did one by one floors, and I know the number of rooms ONLY WHEN THE FLOOR IS SELECTED (as the green box and the number of item (6)). How can   I obtain a list as the yellow one? Thanks a lot in advance!!