Faster way to change a variable name?

[Rayers12 19]

Is there a faster way to change a variable name than going through the unit's boxes? As a man who frequently copies and pastes on the editor, it is very annoying have to update 13 B_1s to Ba s. It is quite annoying. Any tips?

[Deadfast 43]

You can use text editor to edit the mission.sqm if it'll be easier to change that way for you.

[shuko 59]

Or think other ways to work. There is rarely need to name large number of units.