G'day hikarihikari,

Welcome to the monastery.

The Perl Data Structures Cookbook may provide you with an answer. If not, please provide a sample of your data structure: it sounds like you're possibly working with a hash of arrays but that's just a guess. Also, an idea of the output you're expecting would be useful. Any code you've already attempted may prove helpful. Take a look at "How do I post a question effectively?" to get an idea of the type of information that's appropriate.