Your code, your sample data and your question are so far apart that in the end I decided to ignore your code and produced the following sample for you to consider:

use strict;
use warnings;

my %jobs;

while (<DATA>) {
    chomp;
    next if ! /\S/;

    my @parts = split;
    
    push @{$jobs{$parts[1]}}, $_;
}

print "$_\n" for map {join "\n", @{$jobs{$_}}} sort keys %jobs;

__DATA__
DOABIL3020 ITSD-ENT_OP-DMSB-DIDS Ora
DOABIL309 EXE-SOS-3201_DFLT Ora

DOABIL3400 ITSD-ENT_OP-ETSB-MID PRD

DOABIL5310 ITSD-ENT_OP-ETSB-MID TST

DOABIL6230 EXE-SOS-3201_DFLT PRD

DOABIL7001 ITSD-ENT_OP-ETSB-EAS PRD

DOABIL7005 ITSD-ENT_OP-AIMB-DCSEC PRD

DOABIL7006 ITSD-ENT_OP-AIMB-DCSEC PRD
DOABIL7504 EXE-SOS-3201_DFLT PRD
DOABIL7581 ITSD-ENT_OP-NTSB-NET PRD
DOABIL7582 ITSD-ENT_OP-NTSB-NET PRD
DOABIL7583 ITSD-ENT_OP-NTSB-NET PRD
[download]

Prints:

DOABIL309 EXE-SOS-3201_DFLT Ora
DOABIL6230 EXE-SOS-3201_DFLT PRD
DOABIL7504 EXE-SOS-3201_DFLT PRD
DOABIL7005 ITSD-ENT_OP-AIMB-DCSEC PRD
DOABIL7006 ITSD-ENT_OP-AIMB-DCSEC PRD
DOABIL3020 ITSD-ENT_OP-DMSB-DIDS Ora
DOABIL7001 ITSD-ENT_OP-ETSB-EAS PRD
DOABIL3400 ITSD-ENT_OP-ETSB-MID PRD
DOABIL5310 ITSD-ENT_OP-ETSB-MID TST
DOABIL7581 ITSD-ENT_OP-NTSB-NET PRD
DOABIL7582 ITSD-ENT_OP-NTSB-NET PRD
DOABIL7583 ITSD-ENT_OP-NTSB-NET PRD
[download]

I can't tell which field you really want to sort on so I took a guess.

As others have suggested: you should always use strictures (use strict; use warnings;). Also, remove code that is no longer relevant (use a revision control system if you think you may need to go back to a past version of the code) and find an indentation scheme that works for you and stick with it. Consistent and accurate indentation can make your code much easier to understand!