Need more information.

If you want 4 arrays to go into one hash value:

@a1 = (1, 2, 3);
@a2 = ...;
@a3 = ...;
@a4 = ...;

$some_hash{$some_key} = [ \@a1, \@a2, \@a3, \@a4 ];

print "First array, 2nd value: ";
print $some_hash{$some_key}->[0]->[1];   # 2
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I don't really know if that's what you're asking, but if I read your question literally, it is. Otherwise, follow up your post with something that gives us some specifics about what exactly you're trying to do.