Power Query. Нарастающий итог внутри категории

You need to create a running total not for the entire table, but for each window. Files for Boosty sponsors: https://boosty.to/comrade-xl/posts/e3... Files for VK sponsors: https://vk.com/comrade.excel?w=wall-1... Files for YouTube sponsors:    • Post   Become a sponsor:    / @comrade_excel   🧑‍🏫 Individual training: https://comrade-xl.ru/pq-training/ 💻 Lesson page on the website: https://comrade-xl.ru/2022/07/05/pq-v... Episodes: 00:00 What this lesson is about 01:26 Preparing the data 09:23 Creating a running total function