How to access a variable one level above prog() if not declared in current prog()

Hello All,

To avoid using a long name (such as proABC.localVar1 ), how do I access the variable "localVar1" that is outside current prog()?

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procedure(proABC() 

   prog( (localVar1)

       localVar1 = 1

       if( (t)

            then

            prog( ()

               localVar1 = 3       ;; note I did not declare any variable named "localVar1" in this prog(). I would expect this to use the variable declared earlier

               printf( "localVar1 in IF statement = %d " localVar1)      ;; this prints 3

            )

       )

       printf( "localVar1 outside IF statement = %d " localVar1)      ;; this prints 1

   )

) 

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Thanks All