Return a value from Start a Workflow Action

You can achieve it but not directly  There is no possibility for communications between workflows in O365 ( you can achieve that in on premises workflows: send and receive workflow data ).

In O365 I'd suggest you to:

1. create a column in the list/ library where your child workflow operates,
2. in your primary workflow create a loop with a pause action: pause you primary workflow for a minute or a time that you think the child workflow requires to complete its execution,
3. in your child workflow add action to update the column in the list with the information you want to pass to the primary workflow,
4. once your primary workflow unpauses query that list and check value of the column. If it is still empty then make another loop. If it has value end your loop.

That is the only way I can imagine to pass the value back.

Regards,

Tomasz

That is why I suggested you the loop

Maybe that would become handy for you: https://community.nintex.com/community/tech-blog/blog/2016/09/06/linkin-tasks-or-how-to-get-that-pesky-task-item-url

Regards,

Tomasz

Of course, you can put that action inside your primary workflow, but for some reason you wanted to separate them. But again - I am not aware of all requirements you have for the workflow.

The "start task process" action does not return you IDs of the created tasks (only "assign a task" action does it).

Regards,

Tomasz