Make auto reneweing subscriptions exclusive to each other and ordered

Hello,

I have a question concerning the management of Android paid subscriptions. I added some subscriptions to my app but I don't have any option for organizing these in some sort of order (or ranking).

Hence it is possible for a user to subscribe to more than one of them. This makes no sence since the subscriptions have an order (package S, package M, package L, ...). Also how does Android now know what's considered an upgrade or a downgrade?

So how can I order subscriptions in the Google Play Dev Console and how can I make them exclusive in order to avoid that users can subscribe to more than one at a time.

Any advice is highly appreciated.

Bye