In May 2017 Power BI Desktop started supporting creation of DAX measures when working in live connect mode to an external SSAS model: https://powerbi.microsoft.com/en-us/blog/power-bi-desktop-may-fea...
Really in need of creating calculated columns when connected to SSAS Live from PBI Desktop. In our org, to deploy SSAS changes, we need huge process in place. Only PBI changes is in hands of power users. Giving this contol will be a huge advantage for many users.
