Dynamic sum in webi (runningsum)

In Excel, all objects are based on cells. Therefore, it is easy to implement a series such as 1, 2, 3, and 4. How can we implement it in webi? The basic object of webi is dimension, which is equivalent to a column in Excel. How can I do this? Or have a more specific requirement, such:

 

I want to accumulate the revenue in each quarter, that is, Q1, Q1 + q2, Q1 + q2 + Q3. How can I do this? Webi provides the runningsum function to solve the problem that the basic object is too large to sum small objects.Runningsum ([revenue])That's all. What's next? SimpleRunningsum (1)You can. To better understand this function, try runningsum (3) to see what the result is. Finally, let's go to the exercise. If there is another dimension country, how can we sum the sum according to country and quarter?