Another way is to refactor them into four separate classes, based on your $dcr_type variable. A fifth class, would be used as a sort of factory and would decide which subclass to return based on the value of the $dcr_type. You would still have the if...then logic, but it is hidden by a separate layer of abstraction. It would go something like this (this is just an example, so the code below is very skimpy)

package factory;

#We don't need any logic in this constructor, so...
sub new {
   
    my $class = shift;
    bless {}, $class;
}

sub getInstance {
    my ($class, $dcr_type, @row) = ( $_[0], uc $_[1], @{$_[2]} );
    if ($dcr_type eq "CONTACT"){
        return contact->new(@row);
    }
    elsif($dcr_type eq "LITERATURE"){
        return literature->new(@row);
    }
    elsif($dcr_type eq "FAQ"){
        return faq->new(@row);
    }
    elsif($dcr_type eq "ORGANIZATION"){
        return organization->new(@row);
    }
}

package contact;

sub new {...}

sub doTheDeed{
    return ('HQ' , undef);
}

package literature;

sub new {...}

# @_row is this classes local version of the @row parameter
sub doTheDeed{
    return (undef, $_row[4])
}

package faq;
sub new {...}

# @_row is this classes local version of the @row parameter
sub doTheDeed{
    return (undef, $_row[2] eq 'Service' ? $_row[3] : $_row[4]);
}

package organization;
sub new {...}


# @_row is this classes local version of the @row parameter
sub doTheDeed{
    my @ret = ($_row[2], undef);
    $ret[0] = 'HQ' if ($_row[0] eq 'Headquarters');
    return @ret;
}
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Now your main body code will look like:

my $fact = factory->new();
my $instance = $fact->getInstance($dcr_type, @row);
return $instance->doTheDeed();
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