%TotCst is a hash whose values are hash references: 
my $AppCodeID = $AppCode{$ID};
my $CstTypeID = $CstType{$ID};
my $hash_reference = $TotCst{$AppCodeID};
$hash_reference->{$CstTypeID} += $InvAmnt{$ID};

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In reply to Re: Hashes and arrows by tangent
in thread Hashes and arrows by enttoobad

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