I'm not sure I understand what you mean?

## Assign appropriate values to 3 different slots in the glob
*t = sub{ print 42 }; *t = \'fred'; *t = [ 1,2,3];;

## And print them
print join "\n", t(), $t, "@t";;
42
1
fred
1 2 3

## Locally override the code slot and print them--the others are untou
+ched.
{
    local *t = sub { print 'changed' }; 
    print join "\n", t(), $t, "@t"; 
};;
Subroutine main::t redefined at (eval 5) line 1, <STDIN> line 3.
changed
1
fred
1 2 3

## print them again having exited the block, 
## and they all retain their original values
print join "\n", t(), $t, "@t";;
42
1
fred
1 2 3
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