如何从上游传递参数到下游

I have 3 builds: A - is the Master build which control the flow B- Anoter build C- will be executed after B I want to add a String parameter to A so the user will enter some String manually, and i'm not sure how can i path this parameter to B. lets say that this is my build flow: I have 3 builds: A - is the Master build which