While there’s no one step that does exactly this on it’s own, we can accomplish this operation using multiple steps together.
In the below example, we use a “Filter Rows” step to identify rows where you’d like to calculate a running total. The other “Filter Rows” step is filtering for the exact opposite (can duplicate the first filter step and just change the setting from “Keep” to “Remove”). In total, these 2 filter steps should contain all of your rows of data.
You can then use the “Insert running total column” step after the appropriate filter step, then combine the data back together with a “Stack Tables” step. If having the data in the original order is helpful, you can use an “Insert Row Numbers” step before the filtering, as seen in the example. Then, after stacking the tables, we can sort the table by row number.
Here is a snippet of this example that you can plug right into your flow: parabola:cb:22cf86ed01f54ee58298aaaaf85080e5
Let us know if you have any other questions!