Restructure Purchase Order Form?

Hi all

I am in learning phase of SAP BYD.

I have task to restructure the Purchase order Form.

Contact should be

Purchase request and orders (WC) > Purchase order / Général tab

• Buyer responsible field

Below Contact I want to put new label Service

Service->

Purchase request and orders (WC) > Purchase order / General tab

  Double click on Buyer responsible field to display employee Overview and use Reporting Line unit as service.

Can any help me to achieve this?

THanks & Regards

PRAT