rdlc report - grouping between tables in a dataset

Hi All,

In my rdlc report i had header and footer. Header had two rectangles for customer info and invoice info.In body i have other details like product info, warehouse info etc.

for the above scenario i retrieved info from db (not sql) and mapped with corresponding fields. (My dataset xsd had all the information as tables with primary key)

For a single record it works fine. I need to group this details based on primary key (invoice id). If i have 5 records it needs generate 5 invoice. but now it list all the values in a same report.

help me to over come with this.