[otrs] customising agent view

Hi Is it possible and can someone tell me how I do the following? I need a sub category in each queue which can take the form of a drop down list, dynamically constructed depending on the queue. All this sub category is used for really is reporting and I tried initially creating sub-queues but this proved unfeasable. Has anyone else done anything like this?? or could someone send me the perl needed to implement?? I assume I need to add an extra field in the database but that won't be a problem. Thanks ever so much, in advance Philippa Strange