Expression Builder help with Link to next step

I’m trying to figure out how to have a custom Link to next step process (Expression builder?) to take the user back to a specific document that has a pending task assigned to it. 

Here’s my current high level process:

I have a Master Document that gets generated with a task to do something.  In order for the user to complete the task there need to be supplemental documents submitted.  I have a totally different “intake workflow” built to kick off a User Task to review incoming documents. This Workflow finds the Master document and relates the supplemental documents upon arrival.  I’d like for that separate workflow to redirect the the User to the Master Document task screen.  

Current outcome. (not what I want)

After completing the separate workflow review task the user is just directed back to the Task screen.

Question:

My question is how can I redirect the User to the Master Document Task screen after completing their review task (separate workflow).  I’m guessing I have to use the Expression builder or something else.  If the Expression builder what kind of expression would I write and what document data would I need.  Or, what other solutions are there.

Thank you in advance.