Labeling in Macros

I'm building my base showfile in 2.7.3, and trying to make a way to easily label sets of groups. This has brought up two issues:

I'd like to have a macro that can add text to current labels (for instance, if I had a group called "1E S4s", and the macro appends "SR" to it). When I run the macro, though, it deletes the previous text and leaves only what I wanted appended. Is there some way around this?

Additionally, I'd like to be able to label one group and have that label copied to several other groups (it may sound useless, but that's where the appending part comes in). I can't figure out a way to do this.

Thank you!

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