#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11106277
use warnings;

my $order = '*order*';
my %hash;

while( <DATA> )
  {
  my ($vitem, $project, $segments) = /(\w+),(\w+:\d+)\|(.*)/;
  exists $hash{$project} or push @{$hash{$order}}, $project;
  exists $hash{$project}{$vitem} or push @{$hash{$project}{$order}}, $vitem;
  push @{$hash{$project}{$vitem}}, split /;/, $segments;
  }

for my $project ( @{ $hash{$order} } )
  {
  print "Project: $project\n";
  for my $vitem ( @{ $hash{$project}{$order} } )
    {
    print "  Vitem: $vitem\n";
    for my $segment ( @{ $hash{$project}{$vitem} } )
      {
      print "    Segment: $segment\n";
      }
    }
  }

__DATA__
J_071117,BM:3|12.0-25.2;32.9-88.0
J_070424,BM:3|625-920;1017.905-1178
J_021212,BB:1|123-166;409-455
070526,SWT:1|53.160-59.320;77.720-86.120;370.800-416.800
070609,SWT:1|713.760-1159.200
070616a,SWT:1|0.0-652.0
070616b,SWT:1|401.40-461.800;483.160-490.640;503.400-595.200;602.440-695.400;699.200-882.400
J_071019a,SWT:1|372.925-910.385;927.620-1038.830
J_071019b,SWT:1|268.15-808.330
J_071025,SWT:1|936.215-1659.635
071123_F,SWT:1|45.4550-81.665