Merge queries using a specific step using the UI in Power Query

[potap]

I often use the actual query and merge it with itself but I am joining the last step with one of the previous step. The UI automatically refer to the last step on both sides of the join so I have to change the name of the step in the formula bar. Would be great if we could choose directly in the UI which step of the actual query we want to merge. It would also be a lot easier for the casual users.