That's pretty trivial with map:
#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dumper;
my @rows = (
[
'AA1',
'BB1'
],
[
undef,
undef
],
[
111,
101
],
[
222,
202
],
[
333,
303
],
[
444,
404
],
[
555,
505
],
[
666,
606
],
[
777,
707
],
[
888,
808
],
[
999,
909
]
);
my @bb1 = map { $_->[1] } @rows;
print Dumper \@bb1;
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