G'day NetWallah,

"I'm looking for comments on how to avoid/minimize the global declarations."

I haven't tested your code, nor delved into your logic; however, in response to that specific request for comments, this type of structure may do what you want:

{
    my $actionFlag = 'NONE';
    my $Options = build_options(\$actionFlag);
    my $stack = [[ 'Options', $Options ]];

    while ($actionFlag ne 'EXIT') {
        ...
            pop @$stack if @$stack > 1;
        ...
        Display_Options_and_Get_Response($stack);
    }
}

sub Display_Options_and_Get_Response {
    my $stack = shift;
    my ($header, $opt) = @{$stack->[-1]}[0, 1];
    ...
        push @$stack, [ ... ];
    ...
}

sub build_options {
    my $action_flag_ref = shift;

    return [
        ...
            sub { ... $$action_flag_ref = 'EXIT' }
        ...
    ];
}
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