The following first builds a hash of alpha keys containing the individual keys, then uses that to generate the table.

use strict;
use warnings;

my %hoh =
    (
    A1 => {bl=>0, ff=>4, gg=>3},
    A2 => {cc=>5, dd=>4, ee=>9},
    B1 => {og=>0, wo=>4, ee=>3},
    B2 => {oo=>5, pp=>4, zz=>9},
    );

my %alphaKeys;

push @{$alphaKeys{(/^([a-z]+)/i)[0]}}, $_ for keys %hoh;
keys %hoh;

for (sort keys %alphaKeys) {
    my @lines;
    
    for my $key (@{$alphaKeys{$_}}) {
        my $index = 0;
        $lines[$index++] .= sprintf "%-20s", $key;
        
        my %items = %{$hoh{$key}};
        $lines[$index++] .= sprintf "%-20s", "$_=>$items{$_}" for sort
+ keys %items;
    }

    print "$_\n" for @lines;
    print "\n";
}

[download]

Prints:

A1                  A2                  
bl=>0               cc=>5               
ff=>4               dd=>4               
gg=>3               ee=>9               

B1                  B2                  
ee=>3               oo=>5               
og=>0               pp=>4               
wo=>4               zz=>9

[download]

Update: changed map to for per Tye's suggestion

DWIM is Perl's answer to Gödel

In reply to Re: Hash printing problem by GrandFather
in thread Hash printing problem by tamaguchi

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