Thank you very much for your honest and helpful response. I appreciate your guidance. I do not want my code to be convoluted. I want to learn how to write Perl efficiently. I've created a seperate frame as you suggested and added a reset button with gridForget on the popup frame. Everything is cleared and the widgets disappear when reset is activated, however, when I put in a new value, the widgets do not popup a second time. If there are any other suggestions you have to make my code less convoluted, please let me know so I can make it better.

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

######################################################################
+#####################
# GUI Building 
######################################################################
+#####################

# make the selections available to the print_input_values sub
my %t;
my %mat;
my %ort;
my %mat_lab;
my $scr;
# Create Main Window
my $mw = new MainWindow;
my $lam_num;
my $row=1;
my $column=1;

my $lam_mat_frm = $mw -> Frame();
$lam_mat_frm->grid(-row=>$row, -column=>$column,-columnspan=>6);

my $lam_num_lab = $lam_mat_frm -> Label(-text=>"Input the number of pl
+ies in the laminate.",
    -font=>"ansi 10 bold");
$lam_num_lab->grid(-row=>$row, -column=>$column);

$column++;
my $lam_num_ent = $lam_mat_frm -> Entry(-textvariable=> \$lam_num);
$lam_num_ent->grid(-row=>$row, -column=>$column);

$column++;
my $lam_data_button = $lam_mat_frm->Button(-text=>"Input Laminate Data
+",
    -command=> \&input_lam_data);
$lam_data_button->grid(-row=>$row, -column=>$column);

$column++;
my $reset_button = $lam_mat_frm->Button(-text=>"Reset",
    -command=> \&do_reset);
$reset_button->grid(-row=>$row, -column=>$column);

$row++;
my $lam_frm = $mw -> Frame();
$lam_frm->grid(-row=>$row,-column=>$column,-columnspan=>6);

    
MainLoop;


sub do_reset {
    $lam_num_ent->delete(0,'end');
    $lam_frm->gridForget;
}

sub input_lam_data {
    $row=4;
    $column=2;
    my @lam_mat_t_lab = (
    'Material',
    'Thickness',
    'Orientation',
    );
    my $n = 1;
    for my $label (@lam_mat_t_lab) {
        $mat_lab{$n} = $lam_frm -> Label (-text=> $label,
        -font=>"ansi 8 bold");
        $mat_lab{$n}->grid(-row=>$row, -column=>$column);
        $column=$column+1;
    };
    my %ply_lab;
    $n = 1;
    $row=5;
    do {
        $column = 1;
        $ply_lab{$n} = $lam_frm -> Label (-text=>"Ply $n",
        -font=>"ansi 8 bold");
        $ply_lab{$n}->grid(-row=>$row,-column=>$column);
        $row = $row+1;
        $n = $n+1;
    } until ($n == $lam_num+1);

    # Create Material Optionmenus
    my @mats = ("PW","8HS","Tape");
    my %mat_optmen;
    $n = 1;
    $row=5;
    $column=2;
    do {
        $mat_optmen{$n} = $lam_frm -> Optionmenu(-options => \@mats,
        -variable => \$mat{$n});
        $mat_optmen{$n}->grid(-row=>$row,-column=>$column);
        $row=$row+1;
        $n = $n + 1;
    } until ($n == $lam_num+1);
    
    # Create Thickness Optionmenus
    my @ts = ("0.0077","0.0147","0.0054");
    my %t_optmen;
    $n = 1;
    $row=5;
    $column=3;
    do {
        $t_optmen{$n} = $lam_frm -> Optionmenu(-options => \@ts,
        -variable => \$t{$n});
        $t_optmen{$n}->grid(-row=>$row,-column=>$column);
        $row=$row+1;
        $n = $n + 1;
    } until ($n == $lam_num+1);

    # Create Orientation Optionmenus
    my @orts = ("-45","0","45","90");
    my %ort_optmen;
    $n = 1;
    $row=5;
    $column=4;
    do {
        $ort_optmen{$n} = $lam_frm -> Optionmenu(-options => \@orts,
        -variable => \$ort{$n});
        $ort_optmen{$n}->grid(-row=>$row,-column=>$column);
        $row=$row+1;
        $n = $n + 1;
    } until ($n == $lam_num+1);
    my $print_button = $lam_frm->Button(-text=>"Print BJSFM Input File
+",
    -command=> \&print_input_file);
    $print_button->grid(-row=>$row,-column=>1);
}
[download]

I think I figured it out. Thanks! I added this to the do_reset sub.

sub do_reset {
    $lam_num_ent->delete(0,'end');
    $lam_frm->gridForget;
    $lam_frm = $mw -> Frame();
    $lam_frm->grid(-row=>$row,-column=>$column,-columnspan=>6);
}
[download]

Now you are learning! :-) You ought to set a default value in your input entry to avoid the warning when the calculate button is pressed with nothing in the Entry.

---

I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh