Add part of one hash to another

[batrams]

Hi - I have two similar but different csv data files:

File A Field 0: Part Number Field 1: Description Field 2: Price

File B Field 0: Part Number Field 1: Description Field 2: New Part Number Field 3: Price

I read File A's data in using this code. I'm sure it can be done in other or more efficient ways but this works well for me:

#################################
# reading data in from File A

 while ( <> ) {
    $csv->parse($_);
    push(@AoA, [$csv->fields]);
 }

# load up the hash
for my  $i ( 0 ..  $#AoA ) {

$HoA{$AoA[$i][5]} = $AoA[$i];

} # end looping over rows
#################################

I then read File B's data in a similar way:

#################################
# reading data in from File B
while ( <TEXTFILE> ) {
    $csv->parse($_);
    push(@H_USES, [$csv->fields]);
   }
close(TEXTFILE);
print "Done Loading USES Data\n";

# load up the hash
for my  $i ( 0 ..  $#H_USES ) {
$H_USES{$H_USES[$i][5]} = $H_USES[$i];
} # end looping over rows
#################################

Now I want to append data from File B onto the the hash I made from File A. If the file structures were identical I could simply do this:

##################################
# Add on File B's data
for my  $i ( 0 ..  $#H_USES ) {
$HoA{$H_USES[$i][5]} = $H_USES[$i];
} # end looping over rows
##################################

But of course they are not identical. I want to simply ignore or skip over Field 2 from File B. I'm having trouble cooking up how to do this, so I thought I'd ask the gurus here. Any ideas would be appreciated.