Remove old plans from a Marketplace offer

JonathanNativ 

There are a couple scenarios here Jonathan. 

1.  Stop distribution of an offer or plan such that no new customers can purchase it (existing customer subscriptions continue). Update an existing offer - Microsoft commercial marketplace - Marketplace publisher | Microsoft Learn
2. Publisher elects to Delist, Remove, or Terminate their offer entirely from the marketplace (impacts to existing customer subscriptions). This requires Microsoft support. 
3. There are also special considerations related to VM offers Deprecate or restore a virtual machine offer from Azure Marketplace - Marketplace publisher | Microsoft Learn

I hope this guidance help answer your question.