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There is a precious little information on how this works.
Community blogs and Ax forums have raised the issue for several years with Ax 2012 12 also - everyone points to the same broken Coli Mitchell blog link- even the old TechNet help.
A lot of users are hoping that this feature will finally become usable at D365 FO with informed help.
STATUS DETAILS
Under Review

42ec509c 681c-418f-970b-9207e88fb366 (administrator) on 9/21/2017 10:33:52 PM
Thank you for your feedback. We need some more details to understand your suggestion better. Can you please help us by answering the following questions?
Is is a generic topic for how subworkflows work you are missing?
Or if it is for purchase requisition, is there any specific scenario you want to see a wiki on ?
I do not know the link you are referring to, so if you could share what was described as useful information there, it could help in understanding the need for documentation.
Sincerely,
Mai Kirknel
PM, Microsoft