I want to do something like that. Automatically suspend the domains on my specified date. Or automatically suspend after 1 year after the insertion date. I can do that.
Just specify "Expiration date" in Service Plan. Then create subscription for your domain, based on this Service Plan. Domain of this subscription will be suspended after reaching expiration date.
Change expiration date for service plan on which these old subscriptions are based and sync changes to these subscriptions. Or click Customize button for subscription and change Expiration date in Subscription settings.