st: Changing labels for multiple variables at the same time

[Anna Reimondos <areimondos@gmail.com>]

Hello,
I would like to define a some new value labels which I want to attach
to all existing value labels in my dataset.

For example, I want to define among other things that  -1 is Missing,
and -3 is Not applicable:

sysuse nlsw88, clear
label define gradlbl -1 "Missing", modify
label define gradlbl -3 "Not applicable", modify

However I want to modify all the labels (a couple of hundred labels in
the dataset I am working on) in the same way not just gradlbl.

Does anyone know of a way to do this? I tried using the extended macro
functions but without much luck.

Thanks very much,
Anna
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