UVMF parameters

In the ALU example provided in UVMF, same parameters appear in multiple yaml files, for example ALU_IN_OP_WIDTH appear in
alu_bunch_cfg.yaml top_env_params section, interface_params section
alu_env_cfg.yaml parameters section.

What’s the link between all these parameters that appear in different places? Does changing one of them change them all? How are these achieved?

I searched in UVMF user guide as well as yaml reference but found no information on this.

Any explanation would be great!