How to view Item dependencies (relationships) in ArcGIS Online using Admin tools for ArcGIS℠ Online (Pro) or (Portal).
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Get Admin Tools here - http://goo.gl/N6mXGZ
Is there a way to get this functionality without spending $500 a year?
If you're comfortable with python and have admin privs, the api has some good tools for this. See How To: Find dependencies in Portal for ArcGIS using ArcGIS API for Python
Yep thats great for 'Portal for ArcGIS'
That article doesn't apply to AGOL