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%h1=( 1=>"one", 2 => "two", 3 => "three", 4 => "four");
@set=(1, 3, 5, 7);

my %h2;
$h2{$_} = $h1{$_} for grep exists $h1{$_}, @set;

%h1=( 1=>"one", 2 => "two", 3 => "three", 4 => "four");
@set=(1, 3, 5, 7);

my %h2 = %h1;
delete $h2{$_} for grep exists $h1{$_}, @set;