Does anyone know how to add a custom saved search sublist to Subscription records? What I want to do (and it seems like this should have been standard anyway, but it isn't) is have a Sublist showing the Usage records associated with a Subscription. I already created the saved search, made it public and available as a List, and set Subscription as the filter. The custom sublists page doesn't give an option for Subscription. Transactions are supported, but I think Subscriptions are actually a type of "Other Record", which is not listed there.

Minor note you typed you have made it available as "List", you will need it to be "available as Sublist View".

Well, a Usage search doesn't have the option for available as Submit View, so perhaps that answers the question. Maybe it's just not supported.