I am running into this issue with a power automate cloud flow. When under a certain condition when the cloud flow runs it needs to update a specific row and key column which would normally be fine except that I need to update a different key column each time with all the other key columns staying exactly the same as they were. The excel action update row allows you to select a different row each time the flow runs but you have to preset the columns that it updates so that's where I have been stuck. I've tried making functions that update each column with the previous value unless it is the column that is being changed but I just don't have the knowledge base to make those functions work and there is next to no documentation on how to write functions in power automate cloud flows.