Defining variables only within a subsystem?

Hi all,

I'm a bit new to Simulink and am having difficulty figuring out how to define variables locally. I have constructed a model with several subsystems, and I would like to define a single variable differently within the context of those subsystems.

For example, is there any way I can define a variable "n" as 3 in one subsystem and as 5 in another? I'd prefer not to name the variables differently (they're used in referencing arrays), and defining at higher levels (model workspace or matlab workspace) would only allow me a single value.

Thanks in advance,
AP