Intercompany Invoicing Across Operatig Units

Hi all

Can you please explain me the inter-compnay invoicing steps

1: created a Internal Requisition in destination operating unit(destination organization)

2: Approve the above internal requisition

3: Create internal sales order at source operating unit and shipping from destination organization

4: Now pick and ship the ISO from destination organization

5: Run the workflow back ground process

till this place i am do the ransaction

Now i would like to create the inter company novices in AR AP.

Can you please provide steps for inter company invoicing process

Thanks

Ramam