Do you want to edit the header structure? Use header builder to change the header layout https://www.youtube.com/playlist?list=PLMqMSqDgPNmDu3kYqh-SAsfUqutW3ohlG
Or what changes do you want to make? Explain in more detail, please. Provide an example for a better understanding. I can’t guide you if I don’t understand what exactly you want to change.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.