Using process variables in subprocesses

Hi all,

I have a large process which I would like to decompose into smaller sub processes (e.g. a process that renders a pdf and sends it to a user) which I then can invoke in a orchestration of all the small workflows. I hope you understand what I am trying to say.

I have set some input and output variables for the subprocess, but in the Workbench no fields for these names appear. I guess this is the way to provide the subprocess with input and output values but I need to do some more setup of the variables I guess however I am not sure what to do.

Sincerely
Kim Christensen