How to coordinate new subscription option with version release

Hello all,

I have an app with a yearly subscription on the App Store. I want to add a monthly subscription that includes new services. I'm confused about the order I should do things. Do I create a new Subscription first in App Connect, test it in my app, then release the new version? Or do I need to create the new version but delay the release until I create the new subscription so they both go for review simultaneously? (But then, how do I test?)

In what may have been an oversight on my part, my app displays all available subscriptions to the user. So I'm worried if I add the monthly subscription option, it would show up to existing users, but the actual new content wouldn't be there.

How to coordinate new subscription option with version release
 
 
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