Hello royserna03, and welcome to the Monastery!

The following script should do what you want:

#!/usr/bin/perl
use strict;
use warnings;
use Excel::Writer::XLSX;

my $workbook  = Excel::Writer::XLSX->new( 'simple.xlsx' );
my $worksheet = $workbook->add_worksheet();

print "How many Serial Numbers do you need?\n";
my $mal  = <STDIN>;
my $comp = 'ITS';
my @array;

for (my $number = 1; $number <= $mal; $number++)
{
    my $exp = $comp . sprintf("%04d", $number);
    push @array, $exp;
}

$worksheet->write_col(0, 0, \@array);
[download]

Some notes:

• Always use strict; and declare lexical variables with my.

• Barewords must be quoted: my $comp = 'ITS';

• If you want (say) 5 serial numbers, and they start at 1, then the last number must be 5, so the loop condition needs to be $number <= $mal.

• You can use sprintf to prepend 0s to the serial number.

• The key point: Each time a new value of $exp is calculated, it must be added to the array. See push.

Hope that helps,

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