Combine 2 tables using Data Sevices 4.0

Dear Experts,

      I'm trying to upload two excel files using Data services 4.0 of which 1 contains just the PO header data like,

Address , PO number, total amount

The other contains all the line items.

So, I took both these files and extracted them into 2 separate template tables.

Now I want to write some transforms so I can load it all in one table.

Here is How it looks

Template Table 1 (Just 1 record)

PO123456

Template Table 2

010 mat1        $100

020 Mat2        $300

030 Mat3        $700

040 Service    $200

No I want to combine these two tables and load the data into my data warehouse as shown below.

PO123456    010           Mat1        $100

PO123456    020           Mat2        $300

PO123456    030           Mat3        $700

PO123456    040           Service    $200

I'm unable to figure-out how to add the PO number to every line of the item data. Can someone help me get it.

Many Thanks

Amit.