As well as lists and hashes, Perl has the capability of handling collections of data in more complex structures; you're limited only by your ingenuity! A study of these more complex structures is vital if you're to understand how Object Orientation works in Perl, and the subject is equally essential if you're going to be doing serious data munging without using objects.

This topic is presented on public courses Perl Programming, Perl for Larger Projects, Perl bootcamp

2tiny	A list of lists - autovivification
deal	A list of lists - dealing a pack of cards
deal2	List of lists - flexible example
hali	Example of a hash of lists
lili	lists of lists - like a multidimensional array
multikey	A Hash of lists - a more complex example
revise	Revision of reference notations in Perl
rn2	Pushing a list v pushing a reference to a list
rq2d	Setting up a hash of lists
rrr	Setting up a list of lists (like a 2D array) from a file

help with creating 2D array in perl requested
Variable call subroutine
how to create a two dimensional array
Sorting a list of hashes
FILE CONVERSION TO AN ARRAY OF ARRAYS
Array references
Aaaaaaargh I am losing my head
Two students on a public Perl course in Melksham