Test scripts - SAP S/4HANA

Hello All,

I'm on the business side and I need to draft some test scripts for the following areas as we are transitioning to SAP S/4HANA:

Customer master – changes, new creations, etc.

Vendor master– changes, new creations, etc.

Cost Center/ Profit Center– changes, new creations, etc.

Do any of you have an idea as to how to create these test scripts to make sure the system is functioning as needed?