$definevariable

From Valve Developer Community

Creates a named string variable. This is tiny subset version of $definemacro that only defines a string substitution that can be in other QC commands.

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Syntax 

$definevariable (variablename) (string)
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Examples 

$definevariable baseFile "fighter1"

$sequence attack $baseFile$_Attack
$sequence run $baseFile$_Run
$sequence idle $baseFile$_Idle
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