newbie question - Using a parameterized build, can I use values defined in my build flow DSL

[letstestthis]

Hi

In a sample build, I have this in the flow dsl 

def env = "test"

I have Trigger parameterized build set up and for the predefined parameters, I would like to use env, how would I use it for that step. 

I tried env=${env} which did not work. Is there another way I can access that value? 

Thanks