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Depending on setup, you can make functions external files, or internal in the script.

https://stackoverflow.com/questions/11419046/how-do-i-return-a-value-from-a-function-in-a-batch-file

External CMD Func:

@ECHO OFF
set %1=WIN10

Call Func:

set myvar=
echo %myvar%
call C:\tmp\test.cmd myvar
echo %myvar%

Inside Script Example:

@echo off

set myvar=
echo %myvar%
call :myfunction myvar
echo %myvar%

:myfunction
set %1=filled
EXIT /B
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