Is there any way to call the same sub-process multiple times from the main process or another sub-process?

I have a sub-process that puts a form in a waiting queue and sends a reminder email on a certain date, among other things. I'm using it right now in my main process, but also have a need for the same functionality in a sub-process. Rather than re-invent the wheel, I'd like to call the existing sub-process.

Thanks!