Summarized field total

Dear All,

            I want to display some data in the following format. i have retrieved data from 5 different tables

1. PO HEADER

2. PO DETAIL

3. PO MISC

4. PO REL

5. RCVDTL

here i want to display the following data along with PO TOTAL. po total is the major concern. Please find the data format.

Please let me know if you need any explanation. How do i display the summary field PO TOTAL.