Enterprise portal how to join sales table and cust packing slip trans in dataset


In enterprise portal->Sales-> Sales Orders ,when i select any sales order corresponding grid of sales Line table is displayed showing item information. i have added a section in that managed part and i want to display data from cust packing slip trans table in that section when i select particular item record from that grid.

as sales table and cust packing slip trans are not directly related with each other. but sales table is related with custpacking slipsaleslink and custpackingslipsaleslink related with custpackingslipjour and custpackingslipjour is related with custpackingsliptrans.

can anybody please tell me how to do it?

what method i have to use in datset to do that?

any help would be appreciated.