Set Variable for operators?

Hello, I'm currently working with Process Windows.

I made some complicated process, so I put whole process in subprocess.

I want easy access to "window size" and "step size"

I would be great if I can set variables for it and just put it in there, So i can control it outsider the subprocess.

such as setting two variables like X = 10, Y = 1.

and put X in window size, and put Y in step size.

Is there anyway to do such?

Thank you!