Custom measures/calulations locally in Power BI Desktop (or your cloud if you wish), for SSAS Multidimentional Live Connections. Cmon! Even Pyramid does this! Don't grey out those buttons! I need to calculate AHT as a sum of 3 components (talk, wrap & hold) and calculate NPS score from survery scores of (P-D)/DNP.
With the new matrix we have some capabilities for breakdwon trees, but this is not that same as decomposition trees. See https://community.powerbi.com/t5/Best-Visual-Contest/Breakdown-Trees/cns-p/7368