Call the header parameters into entire project in SoapUI

If you need some values which are required to be used across the project, then define them at project level as custom properties and use property expansion to refer those values.

Please refer documentation.
https://www.soapui.org/scripting---properties/working-with-properties.html

https://www.soapui.org/scripting-properties/property-expansion.html

If you still have questions, post specific details of the issue.