One way to do it, would be to have listboxes taking the output of the optionmenu.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my @fruits = ("apple","pear","orange","starfruit","pineapple");
my @veggies = ("tomato","chard","spinach","beans","radish");
my @treats = ("chocolate","icecream","raspberries","pretzels","chips")
+;

my %hash = (  fruits=> \@fruits,
              veggies => \@veggies,
              treats=> \@treats);

my @sel = keys %hash;

my $mw =  MainWindow->new(); 

my $choice = 'apple';
my $selection = '';

my $bframe1= $mw->Frame()->pack(-side => "bottom"); 
my $bframe= $mw->Frame()->pack(-side => "bottom"); 

my $list = $bframe->Scrolled('Listbox',
       -listvariable => \@sel,
       -scrollbars=>'osoe',
       )->pack(-side=>'left'); 

my $list1 = $bframe->Scrolled('Listbox',
      # -listvariable => \@sel,
       -scrollbars=>'osoe',
       )->pack(-side=>'right'); 

my $om = $mw->Optionmenu(
        -options=> \@sel,
        -textvariable=>\$choice,
        -width=>'25',
        -command => sub{
              @sel = @{$hash{$choice}}
          },
        )->pack(-expand => '1'); 


$list->bind( '<ButtonRelease-1>', sub { update( $_[0], $list1 ) } );
$list1->bind( '<ButtonRelease-1>', sub {  
                   $selection =  $_[0]->get( $_[0]->curselection  );
                  # print "$sel\n";
                   } );

my $sel_label = $bframe1->Label(
              -textvariable => \$selection)->pack();


MainLoop;

sub update {
    my ( $src, $dst ) = @_;
    my $index = $src->curselection;
    if ($index) {
        $dst->delete( 0, 'end' );
        my $value = $src->get($index);
        foreach my $type(1..100){
             $dst->insert( 'end', $value.$type );
        }
    }
}
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