If you have a treatment for each line of the report you could also put them into an array of subs and then use the % operator to call them one by one:

use strict;
use warnings;
use Data::Dumper;

my @subs;
$subs[  8 ] = sub { $_[0]->{'return1'} = substr $_[1], 0, 39 };
$subs[  9 ] = sub { $_[0]->{'return2'} = substr $_[1], 0, 39 };
$subs[ 10 ] = sub { $_[0]->{'return3'} = substr $_[1], 0, 39 };
$subs[ 11 ] = sub { $_[0]->{'return4'} = substr $_[1], 0, 39 };

my @csv;
while(<DATA>){
    chomp;
    push @csv, {} if 1 == $. % 58;
    $subs[$. % 58]( $csv[-1], $_ ) if defined $subs[$. % 58];
}

print Dumper \@csv;
__DATA__
                                                                 06

    01720168-00000000257980

                                       123 S Somewhere HWY 192
                                        172016-8

         Company NATURAL GAS CO., INC.  Business
         P O BOX 1547                   123 Road Dr.
         Town ST 12345                  SUITE#  1234
                                        Town, ST  12345
[download]

Be aware, that the sub for the 58th line would be $subs[0]. If there is no action for a line, no sub needs to be specified.

This approach would only work if you really have a different approach for each line. If there are interactions between lines, then it probably cannot be fixed...

Update: fixed (removed) link to mod operator