The complex logic required to handle sub menus can get hairy with nested IF statements.

The solution is to make the entire logic data-driven.

I'm not suggesting this code be attempted by a novice , but once the data structure is designed, and driver code written, menus can easily be expanded by one.

In this example, nesting of menus can go to any depth.

#!/usr/bin/perl -w
use strict;
use Term::ANSIColor qw(:constants);

my $actionFlag="NONE"; # An ugly, but necessary Global

my $Options=[
   {NAME=>"Adtran", 
       SUBMENU=>[
            {NAME=>"Adtran 1148V", ACTION=>sub{print "1148V Options\n"
+;}},
            {NAME=>"Adtran 1100F", ACTION=>sub{print "1100F Options\n"
+;}},
            {NAME=>"Go Back",      ACTION=>sub{print "Go Back a Screen
+\n"; $actionFlag="BACK";},COLOR=>YELLOW},
            {NAME=>"Exit",         ACTION=>sub{print "Exit\n"; $action
+Flag="EXIT";},COLOR=>RED},
            ],
   },
   {NAME=>"Alcatel", ACTION=>sub{print "Alcatel ACTION\n";}},
   {NAME=>"Calix",   ACTION=>sub{print "Calix ACTION\n";}},
   {NAME=>"Juniper", ACTION=>sub{print "Juniper ACTION\n";}},
   {NAME=>"Exit",    ACTION=>sub{print "EXIT ACTION\n"; $actionFlag="E
+XIT"},
    COLOR=>RED},

];

#my $current_menu = $Options; # Can't think of an easy way to avoid th
+is global
#my $prev_menu    = $Options;
#my $current_header="Options"; # This won't survive deep menus ... Lef
+t as an exercise..
my @stack = (["Options",$Options]);

#--------------------------------------------------
sub Display_Options_and_Get_Response{
    my ($header, $opt) = @_;

    print GREEN, "------------------------------------\n", RESET;
    print YELLOW, "              $header                \n", RESET;
    print GREEN, "------------------------------------\n", RESET;
    print "\n";

    for (0..$#$opt){
        my $color = $opt->[$_]{COLOR} || GREEN;
        print $color, ($_+1),"   ",$opt->[$_]{NAME},"\n",RESET;
    }
    print YELLOW, "Selection : ", RESET;
    chomp (my $selection = <>);
    if ($selection and  my $selected=$opt->[$selection - 1]){
        if (my $submenu = $selected->{SUBMENU}){
           #$prev_menu    = $opt;
           #$current_menu = $submenu;
           #$current_header = $opt->[$selection - 1]{NAME};
           push @stack,[$opt->[$selection - 1]{NAME}, $submenu];
           return 0;
        }
        if (my $act = $selected->{ACTION}){
            $act->();
        }
        return $selection;
    }
    print RED,"Invalid Selection:",RESET,$selection,
          " try again\n";
    sleep 1;
    return 0;
}

#---------- M A I N   L O O P ----------------------
while ($actionFlag ne "EXIT"){
   if ($actionFlag eq "BACK"){
      pop @stack if @stack > 1;
   }
   $actionFlag = "NONE";
   Display_Options_and_Get_Response($stack[-1][0],  $stack[-1][1]);
}
[download]

UPDATE 1 :made the "BACK" request operational.

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

UPDATE 2: Removed recursion, and track "prev" menu better.

UPDATE 3: Improved "header" of options per O.P, and consolidated globals into one @stack.

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