G'day penny1,

Welcome to the monastery.

Here's how you might go about extracting the data:

#!/usr/bin/env perl -l

use strict;
use warnings;

my ($part_no, @part_info);

while (<DATA>) {
    if (/^partnm_(\d)/) {
        print_part_data($part_no, \@part_info);
        $part_no = $1;
        @part_info = ();
        next;
    }

    push @part_info, $1 if /^(prlot|prwafer|prbin)/;
}

print_part_data($part_no, \@part_info);

sub print_part_data {
    my ($num, $info) = @_;
    print "$num: ", @$info ? join ',' => @$info : 'empty' if defined $
+num;
}

__DATA__
partnm_1
prlot
prwafer
prbin
sspec
fab
partnm_2
sspec
fab
partnm_3
....
....
[download]

Output:

1: prlot,prwafer,prbin
2: empty
3: empty
[download]

You say "I'm able to print the match values in excel file.": you should use the code you're currently using to do this in print_part_data() (I'm just printing to the screen for demo purposes).