Calculation groups debut in Power BI Desktop

Power BI Desktop July 2020 enables creating calculation groups using Tabular Editor.
Discover what you can do with calculation groups and how Tabular Editor is integrated as an external tool in Power BI Desktop.

You can see a step-by-step guide to create your first calculation group in Power BI Desktop with the video Creating calculation groups in Power BI Desktop using Tabular Editor.

Additional resources:
Blog post announcement
Calculation groups in DAX
Chapter 9 of The Definitive Guide to DAX
Tabular Editor
How to learn DAX