basic question on internal table

Iam having multiple po in my internal table

i want my po to be displayed only once in the output.

i need to display the po once only but all the material details to that po should be displayed

po-4500004822, matnr-100-01 ,desc- printer, qty- 10

100-02 fly wheel 50

as you can see po number is not coming in second line item

need to get this using control break statement is their a possibility..